Based on my recent experience with a PJB BG-450, I don't think it had any "bang" to speak of, and given the cost, most definitely not on a "for the buck" basis. It didn't do anything for me, but it is an incredibly well-made piece of gear/art. Clearly, they've got something going on given how much praise they get here and elsewhere. I'm a lifelong electric only player, having likely spent less than 10 minutes on an upright my entire life. In retrospect, the majority of folks singing its praises in what I was reading were at least doubling on, if not primarily playing upright, though most said it sounded great on their electrics, too. They're definitely going to know whether or not it's transparent in its reproduction of their acoustic tone whereas I can't really do that kind of A/B comparison with an electric. I can only compare it with other amps. Are upright players ever going to be looking for something that's going to push a lot of air? Even as it was praised, I read things like: "Don't expect it to make your pant legs flap." or "doesn't push air like a bigger cabinet" and other similar phrases. At the end of the day, it just sounded lifeless and flat to me. Who knows? Maybe that's what true transparency sounds like. I don't doubt it (as I said, the upright guys are going to KNOW). I think it's more of a "Transparency in an electric bass amp just isn't my bag." I really wanted to love the BG-450, but when I was playing through it, I just wanted to stop playing through it and plug back into my Stage 800. What I am now pondering is the idea that (stating the obvious maybe, but that's never stopped me before) for electric bass the amp is an integral part of the sound and after 45+ years of playing, I'm too used to amps that impart tonal coloration to be able to go without that and enjoy true transparency. It may also be that I'm just not a 5" drivers (primary) kind of guy. Given PJB's reputation, this is most definitely a case of: "It's not you, it's me."