I had four pieces assembled.  The two bookshelves and file cabinet were very well done.  However, the assembler struggled with the forth piece, an L Shaped Desk.  In fact, he put part of the front panels upside down so I had to have the desk re-assembled.  However, when the desk was pulled apart, the panel was a mess.  

In the end, I needed to get an entire new desk and hired a different handy man.  However, Wayfair always stand behind their products - they sent me a new desk with minimum hassle.  I wish the first desk had been assembled correctly - no one wants to have to do everything twice - but it worked out in the end.  I am very pleased with the desk itself - the assembly was a bit of a mess.