i love my Juki's, i own 2.
i have the 98Q for frame quilting and i love the beautiful stitch, the consistent tension (i've never had an issue), and its a work horse.
for piecing i have the juki F600, its a 9 inch throat which is great for FMQ, i love the stitch, all the fancy stitches, the fonts for doing labels, needle up/down, thread cutter, knee lift lever, i love the extended base, all the feet that are included, and its a work horse.
and to top it all off I LOVE THE PRICE!!!!
my 98Q cost $500 new and the F600 cost $700 new.
so you get over the top quality for an excellent price.