Went pretty well actually.
Backstrap was in a 2#ish roast.
Seasoned with Mcormicks Montreal steak seasoning.
Set my little smoker to low, it was running 125-150*. I smoked the roast that way for 45min or so then pulled it and set grill to max.
Once it was over 500* I put the roast back on and grilled it like I have seen recommended. Took longer than I thought at high temp to get it done. Probably should have left it on a few min longer as it was a hair underdone in the center (pulled @125, was around 130* when cut). That said it was very good and the slight smoke added to the profile nicely. Steak seasoning seemed a bit overpowering.