I've been using the guitar version of this on my rig for about 3 years (G9.2tt) - I LOVE the "Z pedal" - really handy for the guitar (I play both bass and guitar in my band) - doing live dub out mixes of reverb / delay, blending on the fly - it's really handy. I've been able to get some truly awesome bass sounds out of it, which has really moulded my sound as a bassist now.
The one thing that annoyed me about the G9 is the fact the EQ is useless to a bassist, and I often generate some crazily low harmonics accidentally with some of the crazier effects; there's no bass synth, and the thing is actually quite heavy for a pedal....
The B9 seems to tick all the boxes and it's a steal... I might be tempted to get the bass version instead of the guitar one. Seems to have the Z delay and step filters that I love, as well as the Fuzzface and Tubescreamer distortions I use on my geet.
Has anyone else made the transition and managed to sucessfully transfer G9 patches across to the B9?