Well, hmmm. I don't notice a bounce in my Featherweight, however, I am not a speed sewer. I had to look up the 185J and it looks like a very sturdy machine. Bet it sews like a dream too. Have you tried it? For sturdiness, I would probably go with the 185J. I love my FW, but I purchased it because of it's weight. It does sew a beautiful stitch, however. In the end you have to do what suits your needs best. Not much help, am I!