I find Ermey's TV persona to be a little grating, but he seemed nice enough when my buddies and I ran into him at Knob Creek a few years ago. He was there to film a "Mail Call" episode; we happened to catch him right as he and his crew pulled up. Chatted a bit and took an impromptu photo. The autograph line later in the day was ridiculously long.
Both of the "Lock and Load" shows tonight were pretty good; he certainly gets to play with some neat toys.