With all the reports of the thing not working with the FAST, I thought I'd throw in that the standard box (not HO) I got used off Lonnie Diers works fine with the Big Stuff 3. Granted I have no long term use, but it was definetly not breaking up over 6250 on me. I never used this box with my FAST system though.
FWIW...
FWIW...