My Rec Tec has chewed through most all of the common brand pellets without issue. In over 7 years, it's never experienced a flameout or an auger jam. I've never bothered to sift my pellets before loading them up or empty the hopper between cooks, either. The SmokeFire has only burned B&B so far, because that's all I currently have. B&B Championship Blend & Cherry are what I've mostly settled on these days. I tell myself the cherry tastes better on pork and produces a better smoke ring - but that may just be fiction I tell myself.
I like using Cherry just about everything.