I've had a Q'nique21 with QCT Beginnings for 5 years. Only had a problem with it once - timing issue. Grace support was wonderful, and, with their help, my husband was able to reset it. I never use the built in bobbin winder as I read that it often caused problems with the machine. I bought a standalone bobbin winder for it. I bought it because, at/the time, it was half as much as the similar size HQ + Pro-Stitcher.
Before that I had an HQ16, used with PC Quilter computerized system. It was a great machine. My sister has it now and is quite happy with it.