Earlier this past fall, I needed a way to be able to keep up with my twins who are now almost four. I decided to try coffee and purchased a Keurig, along with some necessary coffee accessories, including a travel mug. There are many choices available but I really wanted a purple one (my favorite color) and this one looked like a good one so I purchased the violet color in the 20 ounce size since that is the only size available for this particular color.This Contigo travel mug is made so you can use both hot and cold beverages in it. It advertises that it will keep your hot beverages hot for up to seven hours and cold beverages cold for up to 18 hours. The mug itself is made of stainless steel and the top is plastic. It is made in China. The lid is dishwasher-safe and the body is hand wash only. This mug cannot be microwaved. The mug comes equipped with Autoseal, which means you have to press the button in order to drink your beverage. There is a lock on the top of the mug and when that's engaged, the Autoseal button won't work at all, in case you want to ensure that the mug won't spill its contents. The 20-ounce mug holds 20 ounces of liquid easily and you won't want to add any more so the top will seal properly and no liquid will spill out. With the lid on, the mug measures 9 1/4 inches tall and without it on, it measures 8 inches tall.I've had this mug for almost five months now and I like it. I like the beautiful violet color and it hasn't peeled off at all but I do have some scratches on it. I'm not rough on my possessions but it's only a few scratches that aren't really noticeable unless I really look closely at it. I can easily hold the mug in my small hands and it also fits well in my car's cupholders. Once the mug is unlocked, I can press the Autoseal button and drink from it with one hand. Then you release the button so the lid closes and, as long as it's properly closed, it shouldn't spill any liquid. I've turned mine upside-down to test it out and never had any liquid spill. When I hold the mug, I can't feel either hot or cold on the outside.Upon receiving this mug, I was disappointed to discover that it isn't compatible with my Keurig K55 Single Serve Programmable K-Cup Pod Coffee Maker, Black because I can't fit it under the brewer even with the drip tray removed. In order to use this mug, I have to brew my coffee into a mug and then pour it in this mug. It isn't optimal but it works. The mug without the top measures 8 inches tall and the space where you place your mug in the Keurig measures just under 7 1/2 inches so this one won't fit. I can't speak for the 16 ounce mug and it's possible that one might fit.I also don't feel this mug keeps beverages hot and cold for as long as it advertises. The reason I say this is because I've brewed 16 ounces of coffee at 8:30 am, added some creamer, and by 11:00 am, the small amount of coffee left is cold. The creamer I use is cold but I use only a couple ounces and wouldn't think it would make that much of a difference in a vacuum-sealed container but maybe it does. I also put water in it, added lots of ice cubes and had it sit on the counter for about four hours. When I opened it, most of the ice had melted and the water was cool but not cold. To be fair to this mug, beverages never last that long for me since I tend to drink water very quickly and coffee doesn't last very long at all either, so if you also tend to drink your beverages quickly, that factor might not matter that much to you.I feel this mug is easy to clean. You'll want to hand wash the body in mild, soapy warm water and the lid is top-rack dishwasher safe. Always allow the parts to dry separately so water doesn't get trapped. If you choose to purchase this mug, there is a sheet of tips which I'd suggest reading prior to using this mug. I won't mention all of them but one helpful tip is that if you fill this with hot liquid, allow the liquid to cool down with the lid off for at least three minutes before putting the top on. Even when I've done this, I press the Autoseal button and the coffee with creamer added is still hot and hurts my lips. I'm not sure if this is normal with coffee mugs but I try to carefully drink with this mug.Overall, I like this mug and have used it several times but I'm disappointed it doesn't fit with my Keurig. I'm still able to use it though and it only requires me washing another dish which is okay. I love the color and the Autoseal feature is a good one to ensure you don't spill hot coffee in your lap on your way to work. I don't feel the mug keeps beverages hot and cold for as long as it advertises and that factor may not bother some prospective customers. Since the biggest factor for me is that I prefer to use this with my Keurig, I opted to purchase Thermos Stainless King 16-Ounce Travel Tumbler, Midnight Blue which I now use more often and it works with my Keurig. If you have no size restrictions and tend to drink your beverages quickly, I'd say this mug is still a good option. However, if you want to use it with a single-cup brewer like the Keurig, I'd look more into the size to see if it will fit. I personally prefer the Thermos travel mug better but the Contigo mug is a little less expensive which may be a factor for some as well. I still use the Contigo mug occasionally but once it doesn't work anymore, I wouldn't purchase another of these again but those are because of my preferences with travel mugs.