The big box is pretty different from the 125 B. The 125B had this blend knob that really was excellent. Probably the best blend I've heard in a pedal. It really was implemented well. I had both the big box and the 125B. Big Box looked awesome, but lacked in the low end. The 125 B fixed that. Good luck finding one though. I think there were 10 total.
Nick posted a snippet of his blend circuit here in the thread a long time ago, it's very cool IMO, and I'm grateful he shared it. Helped me better understand other blend circuits I've seen. I'm hoping to integrate Nick's blend into a few of my own amateur-builds some day.
I'm with cosmicevan on the shoddy practice of flipping by flippin' flippers: It's the flippity-flip-flip's pedal, entitled to do what he/she want with it, but if at all possible I won't knowingly buy a pedal from a flipper — and that's MY entitlement.
TBOMK, out of all the pedals I've bought used, none were bought from F'flippers.
My Mantic bought from Somnambulance doesn't count, 'cause he's a bonafide pedal junky and just wants to try everything, he used to flip a lot of pedals but never flipping bootiki-pedals to profit off of other people who weren't able to get in on a small-run etc.
Spaceman pedals, now there's fertile fields for the F'in flippity-fleep-fleeps. I've got no qualms with pedal-junkies flipping, as they tend to either A) sell for what they bought it for or B) Take a loss.
Either way, pedal-enthusiast-flippers take a hit with all the shipping charges, but that's gotta be factored into the price of privilege to try out pedals. I look at it like a rental price or experience price. You watch a movie in the cinema, you pay for the experience... Cinemas — for all you kids out there, a Cinema's a place where your parents had to go to watch a movie, 'cause there was no such thing as Internet let alone online streaming ...