If you're talking about a new, big Bernina 710, I wouldn't use a bobbin Genie. There should be a back-lash washer in that bobbin case already. If you got the B710 when they first came out, you'll probably want to replace the bobbin case. They came out with a better bobbin case about 3 years later.
If you're talking about an old, mechanical Bernina 710, you could probably use one in that. Although, I'm not even sure if there is an old, mechanical Bernina 710 -- the way Bernina keeps repeating model numbers, it's hard to know.