I have been playing my "new" BB605 and I have some thoughts about it:
-The preamp still "meh". I set a little bass boost, a little treble cut and I don't touch the mids. It works and sounds nice. However, a Delano preamp is already coming.
-I started liking the pickups. Not the best pickups (and will be replaced when I got the money) but they are nice. They sound very tight, a little bit compressed maybe. They are just fine.
-It feels lighter than I expected. The shape is definitely smaller than other BBs I've tried. It's very comfortable to play and the neck feels great. It's more C shaped and feels bigger than the BB735, but it feels good.
-The B string is really good. I don't know if it's because of the pickups, but it sounds focused and punchy. I tried a D'addario XL .130 and it sounded great. Now I have Dunlop Super Brights and the bass feels better, but the B string doesn't feel that good. Anyway, I think is a little bit better than the 735. Just a little, but it's the only aspect that I prefer the 605 to the 735.
I'm pretty happy with the 605. I still prefer the 735 any day of the week, but the 605 is such a cool bass. Definitely a keeper.