I bought the new Bernina quilting frame during the holidays. I have been drooling over long/mid/short arm systems on full frames for years now and DH nudged me over the edge. I wasn't sure that I would really use a big Gammill-type system and held off on the +20k investment. But I took a 4 hour intro class on the HQ system several years ago and didn't like the fliimsy-ness of it. Most of the systems that I demoed vibrated so much that I couldn't see the fabric, let alone lines that were marked to follow.
I purchased the Bernina frame because it is very stable. I purchased the Brother PQ-1500S machine to go with it. Sews straight, has a bit more room than my Bernina 153, and sews fast (1500 stitches/min). I bought the Grace Stitch regulator. It is okay/not great but I don't have the BSR on my 153.
I have completed one practice/charity top and spent a lot of time getting the tension/thread/bobbin set up right
But I am ready to put the next top on and go again. Using Bottom Line in the bobbin, mostly because of the volume on the bobbin vs cotton, but I don't like working with it or the feel of it. Compromises.
Good luck with your decision.
Diana