Actually I wasn't talking about the tube. IMO the tube puts out too much smoke for my MES 40.
5 X 8 AMNPS burns pellets beautifully at any smoker temp.
They say it burns dust good too, but I never tried it, because I also have an AMNS, which burns dust perfectly in smoker temps below about 180*/200*.
My brother-in-law has one of the large barrel type smokers so I think I will make the Tube a gift to him. The 5 X 8 seems good for now.