Carvin is a major player these days, resale prices have really stabilized, the pickups and electronics are much better, and the SB and Bromberg signature series are getting rave reviews by almost everyone.
Still, I haven't been able to convince myself to get an SB, as much as I like the bass. Its got that 70s bass tone, and they refuse to make any accomodations to move the bridge pickup forward... They will do many other Option 50s though, including routing in two massive humbuckers on their other basses. If they made a P bass I'm sure it would fly off the shelves.
For the record, I do own a fretless B4 (with Duncan Model Js..), and it is one of the best fretlesses I've ever played or heard. Used to have a fretted B4, and a fretless LB76. But no more.
Great quality, great playability, great sound (for some), but not great for every single player.. Deal with it.