I used to burn Kimmels bagged nut, which when compared to Blashack bagged I guess you could call it "bad".
Kimmels had double the ash - at least -, it smoked a little & smelled like bituminous when you first tossed it on a hot bed, lots of clinkers in the ash, lots of trash mixed in with the bags ( wood, wire, rocks, mudballs, etc...) , and no matter what methods I used the ash buildup would limit me to 12 hour burns. When I switched to Blaschak it was like night & day. Half the ash, 24 hour burns average, very little "trash" (only wood - no rocks or wire), more heat, & on top of all this, it was CHEAPER! Seems to take a bit longer to get lit than the Kimmels, but I gladly accept the tradeoff.
Seems like nobody else on the board has experienced this with Kimmels, so my former supplier may have been buying cut-rate rejects ??? Who knows. All I know is he went up $40 a ton one year, which is why I ended up with Blaschak. Had that not happened I might not have ever known what I was missing!