I get more volume and better sound (more volume is objective, better sound is clearly very subjective) with the Full Circle than I have with the Realist, Underwood, or RevSolo I. Of course, every pickup is different on every bass, so YMMV. But, the thing I really like about the FC is that it's as close to plug and play as a DB pickup can get. If you already have bridge adjusters (with the right thread) in a well-fitted bridge, it's about impossible to install it incorrectly. Also, once it's in there, it's pretty impervious to the bumps and jolts that sometimes move any of the bridge wing pickups. I am by nature a lazy person, I guess, because I like to show up at the gig and spend about 1 minute fiddling with my equipment before I'm ready to play.
Mark
Mark