I am still using the DIY downdraft mod. I am getting a good bit of smoke flavor on long slow cooks with that and the door seal mod. I just picked up 520lbs of Lumberjack pellets today and am real curious if the smoke flavor will be enhanced any. I did order plenty of 100% wood varieties to test with. I have only been using the RT Ultimate blend to date so I should be able to tell a difference, if any.
The exception to that was a chuck roast I did on Wednesday where I used some B&B (I think) Mesquite blended pellets I picked up from Bass pro. The chuck roast was extremely good and super tender, no knife needed. The smoke flavor was definitely there, but not overly so.