Well, as I have a vintage Singer but haven't used it yet, I can't comment on using them...However, dh is working on it and I hope to try it soon...I can say I have a Brother PQ1500S, and it is amazing for quilting and piecing! It has a 9" harp, and I really like the pin-feed system, it makes piecing a dream, and also I don't have to use my walking foot, as the pin-feed holds all the layers together. It is industrial, all metal. It is only a straight stitch, though...so, if you want zig zag or any extra stitches, this won't be for you..
Good luck and enjoy your search!
Kif
PS I got mine for $599.00, includes a lot of extras