I bought a double and a king size. The instructions were very detailed which meant the frames were put together easily. 
However, there was a part missing from the double bed for which we had to improvise. 
The pillows fall through the rails of the headboard as it does not fully touch the wall.
During normal movement in bed, turning over, the whole bed can be felt moving.
The bed needs to be lifted by two people to avoid damaging the inner legs.
I suppose you get what you pay for and these beds were cheap. 
Personally, I would not recommend these beds even on a tight budget as I do not envisage they will last long andI will have to buy again within a year or two!