I'm so envious--I saw the Juki F600 being demonstrated at a show and talked with the shop owner and rep--I walked around and around the show trying to keep myself from going back and throwing caution to the winds and buying it--good show price too. I have a couple of machines to sell through my local guild's listserv and then----
I do have a Juki TL 98Q which I love but you're right, the F600 is great. I think the 98Q has a slightly wider throat space.
Dana