I have had a Crown Jewel for over a year and absolutely love it. I have had no problems and have done 23 quilts on it. I do not have the Quilt Motion but did use it at my 4 day class put on by Baby Lock.
The Crown Jewel is the same machine as the HQ Avante.
If it is possible for you to go to the Baby Lock class on the Jewel in St. Lewis, do it. It was wonderful. I felt so comfortable with the machine and frame after that.