I have the simpler, mechanical Juki TL 2010Q, which I use for free motion quilting smaller projects. When my fancy Bernina 170 was in for its biennial tune up I used the Juki for my piecing station....and honestly if I had to do it all over again I would use the Juki for my piecing station too!
Unless you need the extra features on the DX, or more than a straight stitch, consider one of the TL models.