I've not been smoking very long, but have used commercial rubs so far. The main reason, is that I lack the appropriate spices in the quantities needed for rubbing a couple butts.
I've been wanting to buy the bulk spices since day one, but haven't "gotten there yet".
That being said, I have wanted to try the SM rub you mentioned, just because of the shear amount of recommendations I've heard here. Maybe I'll not worry so much about making my own.
Meat eater. Woodworker. PS3 Gamer. Home Theater Guy. Beer Drinker.
WSM 22.5 and random cooking stuff used to help form my shapely manly figure.