Iknow 2 folks using them w/o problems. Also the one at my hydro shop hasn't been a problem for them. I'll check in to see if the problem has shown up in this area.

Very interesting thread.

I almost bought one but decided to fill in a corner of my room with plywood etc..... Cheaper than the hut and I only needed 5 ft tall for moms.

If you don't plan to move it around, use wood instead. If it needs to be portable I know someone who built a 4x4x6 room with casters under it.