I have it, haven't used it very much, but love that I can audition my fabrics on the computer in the actual block. Also, I've emailed Christopher several times about questions and he's quick to reply, like a couple of hours. They're constantly working to add things that quilters want and have already added more blocks to his site. I'm in no way affiliated with this site, but I really like it. Will use it more as soon as I finish a couple of UFOs.