I have had an entirely different experience with both brands.
I too, was burning Kimmels for years ... was the first coal I had ever burnt, so had nothing to compare it to. The first year I found giant mud balls, rocks, trash -- you name it .. it was in there, with a little coal thrown in for good measure. As the years went on, the trash & rocks seemed to decrease. On the 4th & final season, they were rock free. Just sticks & wood, here & there. But this last year, it seemed the quality of the coal went down the crapper. I burned 5.25 tons that year & ran out 1.5 months before the warm weather!
Then my supplier raised the price by over $25/ton this last season, so I decided to shop around. Glad I did!!
I found another supplier that had Blaschak ... and was able to deliver it for cheaper than I could pick up the Kimmels. I bought 4.8 tons (4 pallets of 40lb. bags). The first week of burning it was immediately clear that this was better coal. Burned longer, hotter & with a tenth the ash of Kimmels. I was getting 24 hour burns for the first time! I couldn't believe it. The first day I shook down after 12 hours like I used to do, & it seemed like the coal was still ripping hot ... so the next day I let it go ... & 24 hours later it was still hot as hell!
SO here we are at the end of the season. I had not one tenth the ash in my pipe & baffle plate than I had with Kimmels. Cleanout this year was a piece of cake! Not only that, but I still have close to a ton left!!
Not sure if I just happened upon a crappy batch of Kimmels ... or an off-the-charts, kick ass good Blaschak - - all I know is Blaschak will be here next season!