I have an old Pfaff 1222E, a recent ELna 2100 (bottom line) and an inexpensive Janome 8050 from Hancock's. All of these machines will do nice FMQ if you work with the tension - correcting a bit at a time - and if you use good thread. You can't really use the heavier cottons in the bobbin on any of these machines except the Pfaff - it will take even the heavier C&C variegated cottons. I use Masterpiece in the bobbin and King Tut or C&C on top on my Janome 8050 and got the tension to work very very well indeed. Use a topstitch needle - I love size 14, but some use 12, and then if you buy the Janome low tension bobbin case, it is even easier to regulate tension to a lower number on top. I do think almost any machine can do FM with some work and the right combo of threads. I've done lots of small projects between these several machines over a couple of decades before I decided to actually do a whole quilt.