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I've used the Kingsford Comp on and off for about a year now. Usually because I can grab it at the grocery store. It's not bad. But I still prefer a good quality hardwood lump.
I have used Comp K for grilling and would use it again if the price came down a bit, I actually prefer Stubbs briquettes if I have a choice. All briquettes will create too much ash which can choke out the fire on long cooks, which is why many BBQers use lump charcoal. Like The Dude, I prefer lump.