Hi MJP!
I have the Juki QVP2200... the first model that came out, so no stitch regulator. But I learned how to BE the stitch regulator just by using it. No stitch regulator hasn't been a problem. I must have had it about 6 years. I bought it at the Paducah show. It was a demo model that they sold me at a great price, around $5000, including all the extra stuff they had on it for display. So I got a free side wing (and bought the other one myself) and chair, and free teflon slider table cover, and some rulers. All for the $5000!
I've been very happy with it and it's given me no trouble or ever needed servicing. And only the hook needs a drop of oil every bobbin change or two. I have no reason to trade up.
Hope you find something you love!