I think you'll find that the RS (and FC) sounds different on every bass, and is set up with every bass. Just like any pickup, certain ones don't work at all on certain basses.
With the RS, this is a big degree of difference among how the player can fit the RS into the bridge wing. For instance, I like mine super loose. A light tap and the pickup element will come flying out of the bridge. However, I've turned my teacher onto these pickups (he was once an FC user too) and he likes it really really tight. So tight you have you shove it in firmly. He says he gets the best sound that way. Diff'rent strokes.
As for the FC, I liked the bottom-end half-position money notes that it could put out. Really nice there, but the more you went up closer into thumb position, the more pingy it sounded. Drove me nuts. It could've been the setup of the fingerboard, but my bass doesn't do that acoustically. Compared to the FC, the RS was alot more consistent and accurate than the FC.