Anyone have any experience with Bartolini J-bass Quad Coil pickups made for fretless? I've used the regular Bartolini P-Bass style pickups in a fretless before, and they sounded great. Now I have a fretless with J-style pickups and I'm not satisfied with the sound. I'm intrigued by the Bartolini designed for fretless, but hesitate to spend the $ without knowing more about them. How do they sound? Do they enhance the growl and mwaaah of fretless? Also, the set comes with one long (bridge) and one short (neck), the standard Fender configuration. Are they the same except for length, or do they each have a sound designed for the location? My bass has the long in both neck and bridge positions, can I use the long Bartolinis in both? Thanks..