Second- the foot is a small metal circle. I prefer an opening in the foot so I can see exactly where the needle is hitting the fabric. I might use that foot for free motion embroidery (still couldn't see exactly where the needle is hitting) but not for quilting.
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Leslie, the foot that I use that was recommended with the new FMQ bobbin isn't at all like what you're describing. It's a solid clear plastic circle disc with slightly raised sides, I described it in another post as like a Jewish man's hat he wears for services, kinda saucer shaped.
It lies flat on the material, but because the edges are slightly raised, it glides right over thick seams with ease. It has a slot in the center for the needle. I don't remember if it hops or not.
I just went and found the package which is labelled, Janome convertible free motion quilting foot set. It contains, 1. closed-toe foot (this sounds like what you're describing, round metal circle, 2. open-toe foot (small metal U shape) and 3. clear view foot.
It's the clear view foot I like so much, it has circular 1/4 inch marks on it for spacing. I just realized, it's more the size of a quarter than a nickel as I stated in a previous post.
Denise