I use EQ, Sue Spargo, Sew Precise and love them all.
The Baltimore Album BOM I'm running here on the board was designed on Eq.
I play around with them all, helps to decide what blocks to do, what fabrics and colors. Wouldn't do without, beats drafting on grid paper, as I did in the old days.
The sew precise programs, there are 4, are all paper piecing programs. so if you enjoy PP, they are great. I use them alot. I'm doing a double wedding ring from it now, I run newspaper print through my printer and works great.
Sue Spargo is great for wool quilts, which I love doing.