I love my hot coffee and was so excited to try this mug! It is a good looking product and easy enough to work, if you read the instructions! This cup can be set to 3 different temperatures; 135°, 140°, and 145°. I wish the temps were set in increments of 10°, with the lowest cooler than 135°. It's pretty hot at the lowest setting. It kept my coffee hot all day and didn't change the taste. The lid for this cup is honestly useless. I tried everything, but the kids wouldn't seal onto the mug. Is push it down and it popped right back up every time. This is a great mug for home, but definitely not a travel mug. I was pretty disappointed with that. The coaster charges with a 9 volt adapter that is included and charges quickly. The mug is very easy to clean as long as you clean it right away. I really like this mug for the retail price and recommend it for home use, but not travel.