I've got a J&M on both my FJR and the wife's SV650. Pricey, but it works well- especially good for the wife, she just plugs in and goes, doesn't have to deal with lots of cables and connections and junk (like Starcomm).
I've modified mine to have an earphone plug as I use custom-molded earplugs. Wife uses the standard speakers in her helmet, but complains that everything is muffled (she wears earplugs too - wind noise needs to be blocked).
On both bikes, we installed 2-foot NGP Firestick antennas and adusted the SWR - I've not tried the "standard" antenna's as someone else (the ST1100 guys) figured out this is the best setup.
There are two issues with J&M:
1. If you have a Zumo or cell phone, you need to get a $270 J&M wiring harness. Starcomm wins in this realm.
2. I've heard many reports of the parts failing - cords, connectors, headsets, etc. to the point where some carry extra parts on their trips. Last year, four of us had J&M's and only one worked completely. You'd think, for the price, these things would be indestructible or at least replaced for free (and quickly). For the record, the guy with a Starcomm setup wasn't working either ..
Starcomm's main benefit is it's flexibility. J&M's main benefit is that everything is on the handlebar and easy to use.
