OK, here's an update on mine: I no longer have the 7700. I was really unhappy with the way it sewed. My MC4000 sewed MUCH better. The 7700 would not sew over bulky seams. Yeah, I know, Janome knows that and have redesigned the 1/4 foot to fix the problem, but it didn't, at least it didn't on the machine I got. I was so disappointed with the way the thing sewed in comparison to my little old MC, that I took it in and traded it for a Babylock. While I am still disappointed in Janome, I LOVE my new machine.
I know there are a lot of people who love their 7700's, and I hope it turns out well for all of you. But my advice is to take one of YOUR blocks to the store and sew before you buy. Good luck.