Just took delivery of this today. Haven't had a chance to give it a try yet. Literally openend it, plugged it in to check it's working, fired off some shots, then had to get back to building a site for an art festival. Boo!
I'll give it a try tonight when I've finished work. I'm expecting it to sound a million times better than my GSR206 does. I asked about these Bartolinis on basschat.co.uk, and a bunch of the dudes there have told me that the pickups that come with this are actually very good for stock pickups, and the preamp's also very useful.
Bass volutes are awesomely huge:
I think Ibanez BTB's are one of the best bass guitar designs. Congrats man. Wish I still had mine, but I hated that 6th string and the accompanying neck width.