I ordered a 38" twin. Giving it 4-stars because it's okay, but could be better.
Mattress in thinner than what it looks like in the pictures. You can sort of feel the bed frame right underneath when sitting down due to the thin mattress. Although it's thin, it's not that painful when sleeping, but not the best. However, I was really looking forward to a thick mattress like what was displayed on the pictures. It was slightly confusing with the screws going where, but after looking at the images of the screws on there I finally found where each screw was meant to be. If the screws are not in the right place the bed frame is not able to fold correctly. The height is slightly shorter, nearly, below the knees; I wish it was a bit higher, but at the same time it worked for me. The bed does creek when turning in bed. I also did wish the velcro straps were a bit longer just so it can wrap around the bed frame sides better.
I know there's definitely room for improvement. I folding bed is a wonderful idea for easier transportation, but the mattress really needs to be improved (thickness wise) to proved a comfortable sleep or else it's not worth the price paid; a bed frame and thick mattress elsewhere for cheaper price is out there, so foldable beds need to upgrade otherwise all it really has is that it is foldable and has wheels to transport it making it different only reason why people would get it compared to other beds. Otherwise it's not much different from getting a separate bed frame and mattress if the mattress is uncomfortably thin.
