Too late, I already started with a London Underground.

But seriously, I also ordered a Slampegg (mini-tube) from a TB'er around the same time, however, he has dropped out of sight, and I haven't seen it.

Strange, because he had over 100 reviews, none of them negative. But I digress.
I've had a Terror Bass (2nd gen) for a couple of years or so, and I really like it. It sounds very much like what I want a bass amp to sound like. So I had been thinking about a London Underground, and later, an Underground Accelerator for some time. The Terror Bass is my gigging amp, and I have an old Acoustic B200 at church. The B200 isn't in any way a bad amplifier, but it sounds a lot better to me with the London Underground in front of it. The LU seems to have the same character in the mids as my Terror Bass. I haven't played an AD200B, but I'd like to. I'm still hoping the guy that I sent the money to for the Slampegg will come through, but we'll see.