Yeah... I foil. Though I HAVE had success in not foiling but basting every 45 minutes. The basted butt (hey... new team name?) wasn't significantly better than the foiled one and since it was a LOT more work (and I'm essentially a lazy a$$) I stick with foiling.
Pro Q Frontier, UDS (Little Red), "Turtle Drum" UDS, CG Gasser KCBS CBJ#61160