I have one of these, based on an Amazon blog recommendation. Like I said in my review, it is an great mug, survived many drops from roof to street, keeps a good seal, but is short of awesome because of the interface between mouth and mug. There needs to be a little bit of a lip there - it always dribbles or makes a mess.

Also, be sure to aim away from face when breaking the seal on hot coffee....ouch!

This mug is a treat. The thin-walled construction is a bit of a compromise, but the seal is really tight. I've thrown a completely full mug onto the seat of my car without concern. It's great for parents. You can stick it in your back pocket while you carry the kid and his luggage for a trip in the family van, and it doesn't drip at all.

The only downside is the thin walls of the shell. Coffee doesn't normally survive long enough for me to test whether it sustains heat like a thermos, but that's not what I need it for.

My wife has some of these, but I hate that they don't have a raised lip - the hot coffee hits your tongue directly. I prefer my more spillable but easier to sip starbucks travel mug.

Ive got a couple of these mugs... awesome! The only problem is if you get one that is a color other than the natural silver... the colored coating they apply will start to chip and peel away. And I agree with the comment above... The seal is so good... the first couple times you press the button after putting in hot beverage... you will have a pressure blow out of steam coming out the mouth piece... BE CAREFUL!!

I had a colored one too, and while the mug itself is nice, the color came off on my hands.

I've been using this mug for the last year and it is by far the best coffee mug I've ever used, keeps my coffe warm for hours. I have never had any of the problems with dripping, maybe I'm just used to it though.

I bought a set of these at CostCo earlier this year and while I really liked how well it worked, the lid is a royal pain to clean. After awhile you'll notice the gunk building up where the spring mechanisim is and while I've tried a brush, q-tips, and pipe cleaners, you still can't get it all out. I don't have a dishwasher so I have no idea if that will do a better job at cleaning it. I've stopped using mine and have decided to throw them out.

I have a couple of these and they have a few significant shortcomings.

Firstly, the cap of the mug is very thinly insulated - so even though the steel body does a good job at retaining heat, the cap becomes hot and dissipates heat. Secondly, the cap is very fragile and even a 2' fall on hard surface will break it, so be very careful not to drop it anywhere. Thirdly, the opening in the cap is almost flush with its surface- without any "lip"- so you have to be careful with any hot liquid.

Overall the idea of a non-spillable mug is very neat, but the designing could have been better.

I am surprised anyone puts a tall small base vessel containing a liquid anywhere near an electronic device.

Here is an example of the type that is almost impossible to turn over.

http://ecx.images-amazon.com/images/I/21ah4pCi0aL._SL500_AA180_.jpg

I have a couple of these and they have a few significant shortcomings.

Firstly, the cap of the mug is very thinly insulated - so even though the steel body does a good job at retaining heat, the cap becomes hot and dissipates heat. Secondly, the cap is very fragile and even a 2' fall on hard surface will break it, so be very careful not to drop it anywhere. Thirdly, the opening in the cap is almost flush with its surface- without any "lip"- so you have to be careful with any hot liquid.

Overall the idea of a non-spillable mug is very neat, but the designing could have been better.

I bought a two pak of these from Costco for $20 and did not regret it! I agree that the opening isn't perfect, especially when the beverage is really hot. In that case I usually end up drinking it with the lid off. The lid and cup are dishwashable, so I there's no problem keeping it clean. But the greatest thing is, as previously mentioned, it will never spill. Love it love it.

If you keep your bev. below the fill line and the seal dry when you screw on you won't have any leaks ever. The mouth is recessed so either drink what little stays in there after you release the button or push it again to get it to fall back into the mug. "Come On!!" My coffee stays hot forever and if you forget to take a single drink it will still be warm when you get off work. You do have to practice your stiff arm with a button push to let that first jet of steam out though. Great product.
my equally jagged blog review of the mug
http://tinyurl.com/yj4gmg6

This is so far the best travel cup I've owned. I got interested when the woman in front of me at the coffeeshop was filling hers; she demonstrated it to me by turning it upside down after putting the lid on, and not a drop spilled. Eventually I got around to picking up the two-pack at Costco, and loved it. I disagree with the comments above about the "thin wall" impairing the insulation - I've left one a part-full of coffee in my car in the morning, and come back in the evening to find the coffee still hot. For myself, I don't miss the absence of a lip though occasionally a handle would be nice.

I bought this mug in target after i saw a similar product that a worl collaege had bought from a coffee shop. I love that its total indestructible and you can throw i t in a bag without having to worry about spills or leaks.

There are faults though - None of those mentioned above- if the coffee is too hot either - take more care or put cooler coffee in it- afterall its designed to keep hot things hot and cool things cools....come on people!!!

The problem i have with it is not about function its about the aesthetics, i have been using it everyday for nearly a year - the outer shell is actually a coating on aluminum (as the picture above), that coating is coming off- it makes it unsightly and i cant take it in to business meetings as i used to because of that. Still good for my car coffee though!!!

I just purchased two mugs on Amazon. One mug had large dents on opposites sides of the exterior wall. This is very strong metal so a machine or a very heavy object must have compressed the sides of the mug. The dents are obvious even with the wrapper on. What is interesting is the lack of quality control. All the way from China to the Midwest, no one stopped and said to themselves, this is a defective product. It's not worth it to me to pay the postage to return it. With such thick sides, I'll use it as a junk container. Just another piece of Chinese made junk to add to my tool room. The bottom of the mug says: Created by Ignite, Chicago, IL. Too bad Chicago forgot how to make metal containers.

For about $20, I bought a pair of these in a two pack from Costco almost one year ago. One has a red coated finish and red-accented lid, so I use it for coffee when traveling by car on road trips; the other is an un-coated, stainless finish with blue accented lid.

I used the blue/natural one for ice water on my road bike over the summer. It fits tightly into a standard bicycle water bottle holder and kept the ice water cold until empty. The only drawback is its capacity: only 16 ounces. In the arid, high desert of the intermountain western US where I live, I used it in combination with a separate, insulated bladder of 34oz. for a 50oz. total. It was soooooo refreshing to have that ice-cold refreshment on longer training rides during 90+ degree days.

This Contigo mug is rugged! Mine fell out of my bike bottle holder (my fault for not inserting it fully) during a bone-shaking, fast (over 30mph) mountain road descent on Cycle Oregon. It bounced many times down the asphalt before crashing into roadside rocks. The double-walled, metal body was slightly dented, the stainless finish scratched and the plastic lid's rim suffered minor damage, but it still works like new and continues not to leak.

The red mug keeps my coffee hot for, oh, maybe a couple to three hours. For a single user, 16 ounces of hot coffee during that time is adequate.

As for cleaning the lids, I agree with previous comments that it's difficult. I try to rinse coffee out of the red mug and lid promptly. Despite my best cleaning efforts, including soaking in vinegar and baking soda, there's still a trace of coffee odor in the lid. Oh, well.

So, if you can live with the 16 oz. capacity, this is a very good insulated mug.