Relatively easy to assemble.  Always appreciate getting a few more screws than you need. The heating element assembly is built with very good integrity.  The aluminum siding seemed a little cheap until it was entirely assembled.  The entire unit is very sturdy.  Don’t sit on it.  Only issue was the door locking mechanism (see picture).  I had to cut a small piece of metal off to allow it to lock. This was a work anniversary gift and I’m happy with the selection.