Sturdy but the support bars keep popping out and making a cracking sound. One is missing its socket. It didn't come with it at all. Also the mattress will slide off on the frame if you don't put something on it.

Update. The middle support legs are bent and they have to send me replacements that I'm not positive will survive. The "sturdy support bars" are bent and this whole thing just feels cheap now. I can't get on the bed without it creaking or snapping into/out of place. I've had it 2 weeks.