The assembly was off because the holes drilled at the back of the arm rests didn’t match up. The rest of them aligned well. There were always only the one hole on both armrests that would not allow for the proper assembly. I ended up leaving out the connector piece and using a long screw to hold the armrest to the sofa body. Otherwise, the piece looks nice. When extended, the two halves don’t look quite even, the seat part seems higher, possibly softer, than the back part. Since I actually got it for sitting more than sleeping, I’m not too concerned.