I use G30s : one receiver and two transmitters, on two different guitars I switch a couple of times during gigs.
I love it, the sound is perfect (that "calbe tone" thingy is a little silly to me, it's off all the time). Only problem I ever had was loosing the transmitters a few times, but now they're gaffed on the guitar straps and no more problem.
Battery life is kind of generous, but I still use brand new good quality batteries before every gig : batteries die quite abruptly, and I dont spend my time looking at the leds on the transmitters (or receiver).
The other guitar player and the bassist in my band use shure VHF systems, but they'll probably switch to G30 (or 50 or 90) soon, because of the tone quality and the total absence of interferences.
:twisted: