I dont believe you can get a Feedgate for the Rotor, only the halo?
I've never used the Feedgate. But i'm quite happy with my Ultrasoft Crown. Don't seem to lose that many balls, alot less than I expected.
The feedgate does seem to have some "Pod Locating" feature, which seems quite awesome, but might be a bit annoying when using different hands to load. Might get in the way.