Arrived super fast and while we have yet to use it, it looks like it will be perfect.
I ordered the king size which comes in two pieces - each the size of a small single bed. This is ideal as we have two small size mattresses which we were going to use to make up the king size. Now, we have the option to use the frames as two separate single beds as well as joined together as intended, to make a king size bed. 
Really easy to fold out and put together and feels very sturdy.
As others have mentioned, there isn't really anything to hold the mattress in position - but as we've yet to use - i don't yet know how annoying this will be.
We are definitely very pleased with our purchase and it seems to be absolutely perfect for what we wanted it for.