Yesterday I did a 2.5# chunk cut from a whole sirloin tip - I think this is also known as a tri-tip in the west. Brined it for a nite with salt, pepper, bay, & coriander. Then Smoketted it @ 225F until it was around 175F with about an ounce of cherry and an ounce of charcoal. Took approx. 9 hours. Should have cooked it to lower temperature and with a bit less smoke but sort of lost track. Sliced thin it wasn't bad, though.
Also experimented with a few links of sausage from the trimmings. Smoked them until well wrinkled, will see how they taste tonite.
And a maybe unwelcome return to the beef discussion: When I bought the tip at Winn Dixie, in the pile of maybe 20 IBP cryovaced sirloin tips, there were about half marked USDA Choice and about half with no grade.