The other guitar player in my band has been gigging with his VS-1 for quite some time and I've been gigging and travelling with mine since May - no problems. Additionally, the other guitar player works crew for several large concert venues in the Bay Area. He says many of the pro acts coming through use the Peterson. Of course neither he nor I have the V-SAM, so we don't have a speaker in it and I can't vouch for that. As for acoustic, you can buy a sensor from Peterson that clips onto the peghead, sort of like a plastic clothes pin and works very well for tuning acoustic instruments. I think it costs about $20 or so.
Bill, tgo