The support is very nice. Firm yet supple. I don't find it hot but I did cover with a mattress protector and a cooling pad that I had from my previous bed.
From the purchase through delivery to sleeping on this mattress, I have no issues. However, I like to give it some time before I can fully comment as I've had mattresses in the past that were good in the first few months but gradually weren't so good. With that, so far it is a very comfortable mattress which forms neatly to your body's sleeping position and as you move around during your sleep. We picked a firm mattress as when we tried the softer version it felt like we would sink into it. So far, it does regain it's shape after getting out of bed, which is an important aspect. We replaced a previous mattress (it was okay for me) as my spouse said she was having back pains with the mattress. With this TEMPUR she's had no problems at all and she sleeps well now.
My husband and I have slept on various soft/medium Tempur-Pedic mattresses for over 30 years. We have never deviated because we feel that Tempur-Pedic is a good quality mattress that is well constructed and that provides a restful comfortable night's sleep. I love how it contours to our body but is also supportive. We have never been disappointed. Thanks Tempur-Pedic!!!