I'll answer this question like this: I am 6'5'' and weigh 280 lbs. This is the most comfortable mattress I have every slept on. Now with that said, it sleeps very warm. I've recently bought sheets with a higher thread count (1250 from 500) that are "cooling" and that has help tremendously. I would still recommend this mattress to anyone I knew.
In most cases, it's what the mattress goes on that has weight limits. Not the mattress itself. So I would recommend checking what you plan to put the mattress on. Firm mattress offer more support for people commonly have back problems in most cases.