Greg reminds me of some great working guitarists that I've known....in that nothing really blows me away about their tone per se, but that's not really the point. They always play well and their sound gets out...it's good for a lot of different settings. And that's meant as a major compliment, they can always play and bring it no mater what. These are the kinds of guys who can show up with a Boss graphic EQ pedal and Tubescreamer in their gig bag, and get through the night playing great regardless of what they plug into. A real player's player.
Although I must say I'm digging his 335 tone in this stream!