Just ordered it, I'll keep you posted
So, I got the email with the key about 20 mins after I ordered and..... it didn't work :-( I emailed back showing my error.
Not one to give up so easy I got to google and after a couple of trial and errors, low and behold I got it activated and even now I still cannot believe it! I needed to join a machine to a domain and you need 10 pro for that not 10 home so I just saved my client $90!
On a side note, after I had already found the solution via google they emailed me back with the same instructions.
You can pm me for details if you'd like.
Thanks OP!!!