Well, I tried it this weekend. 8lb-er, untrimmed. Gave it a rub and set it going, fat side down, at about 240*. Took it off at 190*. Foiled it and put it in a cooler for about 3 hours.
Huge smoke ring. Tasted great, but was a little dry out on the edge. The rest seemed OK, though. It's possible that, because I used the Guru in ramp mode, it sat at 190* for longer than it should have, and that's what dried it out. Just shredded the point, sliced the flat. Had some sandwiches, then, because it turned cold this weekend, decided to make chili out of the rest.
Best damn chili I've ever made.