I started out with a 15" Bailey just to see if I'd like it. Then I upgraded to a 24" Fusion and had to relearn a lot! After taking some classes and learning about the robotics, I added that to the machine. I don't find it any different FMQ after adding it.
DH got interested with the robotics, and he likes using the machine too. So far we only quilt our own quilts, though DH does want to start doing charity quilts and maybe some for hire.