I have used Electric Quilt software, to design my quilts, for a good number of years, and have enjoyed the heck out of it.  There are things I would change, of course, but once you get used to the software and how it helps you design patterns, it’s quite a nifty tool to use.  While at market, I was stunned at the beautiful paper-pieced quilts they had designed and made using EQ6.  I don’t paper-piece, but I do love a beautiful quilt design!  See for yourself: