I bought it soon after I started quilting, thinking that I am pretty good with computers and I would be designing blocks and quilts in no time, but I found over time that I am too hands-on for this approach. The 'glam' factor faded pretty quick. I need fabric mock-ups and sample blocks and all the EQ7 features just didn't do it for me. I can photocopy fabrics on my color copier, cut them into finish-size pieces, and tape them together in different block configurations faster than I can do the same thing in EQ, and when I'm done I've got all the measurements I need.
I am a hobby quilter and only complete a few quilts a year, and I am not selling patterns.
As for usability, I used to be in computer software business and EQ is not the most intuitive program I've ever worked with, by a long shot. So if anyone tried it and didn't take to it, I can sure understand why.