Only once and it turned out fine. We each made 90 string blocks and then sent each other half - we picked our own setting triangles and backing and each quilted our own. It was enjoyable. Another friend has been asking me to do make a complicated quilt. Actually it would be two quilts. She would do all the hand appliqué. I keep saying no. It is more than I want to commit to. I like doing it all myself - even the quilting.