I have not heard much good about the J&M stuff but to be fair I have never actually HEARD it. Supposedly there is a lot better equipment out there for the money. Case in point, Biketronics or Arc Audio (if we are talking amps).
I have the BT4180.14 and love the simplicity of the system (no gains) and the warranty/customer service. You are not going to find a better warranty and resource for questions than Mike and Donna. If money were no object or I could start all over, I'd get the new BT4250 (so new it's not on their website yet). It is a 4 channel version of the 2250 and has some gain control adjustment. Spendy (I think it's $800-900) but, buy once cry once.
When you start getting the audio bug, there is no stopping. I am SO glad that I bought the 4 channel amp to begin with, even though I "just wanted a little upgrade to my fairing speakers". Ha!
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'15 FLTRXS - V&H Power Duals w/ Screamin' Eagle Street Cannons - Arlen Ness Big Sucker - BT4180.14 w/Arc Moto 602v2 and Polk MM652 - Le Pera Maverick Daddy Long Legs - Advan Lowers - Freedom Shield 15"