so far, my New Queen has the most throat room, but I'll have to mess around to modify a hopping foot to fit. I'll agree with Joe, just a little bit more room makes a big difference, more than you would expect. though I think the biggest difference is having the table room around the machine, and having a slick surface so the quilt glides easily. I really enjoy FMQ with my 15 so far. Way nicer than on my Viking 990. I prefer a straight needle over the slant, but will have to experiment with more slant machines to decide if the slant was the issues, or the particular machine. Or just inexperienced operator!