I had both the Janome 6600p and the Juki F600. (Long story about how I ended up with both). For reasons I never could figure out, I really preferred the 6600 for most sewing. I re-homed the Juki to a fellow quilter and she absolutely loves it for both fmq and piecing.
She makes 6 quilts to my 1, so it's getting a workout and isn't giving her any problems whatsoever.