FWIW Brent, I use both a London Underground, and an Underground Accelerator (LU for main board, UA for my fly rig). There is *very* little to distinguish one from the other, except the tone stacks aren't identical. But, with some knob tweaking, I've got mine to basically sound the same:
On the LU it's Bass- noon, Mids- full, Treble- 10 o'clock.
On the UA it's Bass- 10 o'clock, Mids- full, Treble- 11 o'clock.
Since the LU is discontinued, it could be worth your while to go for the UA instead. I used an Orange amp for 10 years before getting the Sushi pedals. It's pretty much exactly what I'm used to, response-wise!