I have a Pfaff 1200 on a frame. It's nicer for me than having to pin or baste and then wrestle the fabric around, but if I could afford it, I'd go for a larger throat/harp.
By the time you get to the end of a queen size quilt, you're working with just a few inches, because the roll takes up space in the throat. Great for meandering or stippling, not so much for designs other than narrow pantos. All the starting and stopping to complete a design make for a LOT of sitting and burying threads unless you do them as you go, which makes for a LOT of standing and burying threads. ;)