This is also my experience w/ the G50. I have also done gigs on military installations, and at radio stations with it-- and no interference issues to speak of...
I was a Line6 Relay beta tester and I did an official gear review for them on the G30. Still have it to this day and only problem I've had with an outdoor gig was a weird positional issue, but easily resolved. Review can be found on the web. Google search "racerevlon line6 g30"