my parents had one for my bedroom - I had the converted loft as my room. It was fine for the 20-odd years it was used several times a day, and is still used occasionally without problems. they have a wooden one.
Thanks for that - I have had another good look around and can't find negative reviews anywhere so we're going for it. I'm ridiculously excited that we'll actually be able to USE the loft not just think about it.