We have the Pfaff equivalent (1200 GrandQuilter), we and quilt all of our quilts with it. We have the stitch regulator, the Imperial frame, and the Q-bot (which we don't use). We have had some thread breakage issues, but after numerous trips to the shop and questions to members of this board, we think we have resolved all the issues that led to the breakage.
This machine is a great way to enter into the frame quilting world at a more affordable price. The tradeoff is the relatively small throat space.
The bottom line is, don't let the thread breakage issues keep you from buying this machine. If you can afford this and not a full-size LA, this is a great alternative.
Darren