I bought the Quest Plus yesterday and it's wonderful. I spent several hours at the dealers and tried the stitches that are important to me: the buttonholes, hems, 1/4" piecing etc. I even tried free motion for the first time. Only drawbacks so far are too many stitches have a default of 2 and for basting a 6 would have been nice. I have the automatic cutter on a Viking and I don't care for it. It leaves a noticeable (to me) knot.
Mary Ellen