NZ, the spiral was a challenge. I discovered "tucks" on the back and had to pick out way to much quilting. Yes, I will try it again but only on smaller quilts.
Lessons learned:
1.Spray my piece heavily with spray baste so nothing moves.
2.The constant turning of the quilt is hard to handle but gets better as the circle gets wider.
3.Slow and steady is better than fast and crooked even when you think you've "got it". (I didn't but thought I did.)
3.Keep trying new techniques. It is good for the brain!