I do find that I get warmer sleeping on the mattress than I would on a traditional spring mattress. The mattress is also a bit firmer than I would prefer, but I sleep well through the night. There is no motion transfer. Overall, I think it is an exceptional product for the price.
Have been having lower back pain ever since I have been sleeping on this mattress. I really really wanted this to be the mattress for me, but I'm not sure if it will stick. It has only been a couple of weeks, i will try it out for a couple more and reevaluate.