OMG.  Had I not just spent the last 3 hours trying to fit a square peg into a round hole (literally), I would have sent it back.  Drilled holes didn't fit the screws for the keyboard attachment, so can't use that.  When I was finally done and just had to screw in the glass desktop from the bottom, 2 screws went in perfectly, 2 just spun around.  They are all the exact same size so can not figure out why they didn't fit.  I even interchanged them with the one's that did fit to see if there was a difference and sure enough, they would not fit either.  Changed them back to the holes that worked.   I ended up having to use 2 of the larger screws from the keyboard assembly since they were longer and at least screwed into the hole.   Trust me.  Pay for the assembled version.  It's worth the $50.  Very frustrating this is so poorly made.   As I said, if I had not spent so much time on it, I would have sent it back.