I've been using these blocks to practice free motion quilting, and with these in particular blocks I've been practicing stitching in the ditch.
My success varies with how much I'm paying attention, how I pressed the back of the block and the direction of the wind. Har, har.
I'm having more success with getting a consistent stitch length, so I'll take my victories where I can get them. I'm hoping with time it will become easier.