Is it creaky?
We are going to replace our bed. Dh wants metal, I'm not sure as I think it'll be creaky. 
Dh isn't massive but he tends to fling himself about a bit - his side of the mattress and sofa are much more knackered than mine. His half of the sofa has needed repairing twice! 
Is there anything to look for that makes a metal bed less likely to creak?