Here's the final update, it was very tender. It was almost prime rib tender. Not much smoke flavor but still tasted amazing. Really surprised how good it was!My brother dropped of a whole sirloin tip roast (11 lbs) and said smoke this, we will be over for dinner. I've never cooked one before . Its a very lean cut. I kept it simple with Kosmos SPG and am going to run the 1600 at 250 until mid rare using Bear mountain Oak pellets. Here goes nothin! Fingers crossed......lol. Iwill update with pics of the finished roast when its done.