Wow, good to see so many people coming over to the dark side, lump is the best IMO also...but there's nothing wrong with K, I use it in a pinch and used some not long ago a local school event in my Smokey Joe.
Phil, there's nothing wrong with Cowboy, although Dave's caution on the nails might be good, I haven't seen any nails though. But I have seen odd cut-offs from what appeared to be cabinet shops, but they were coal. For me, the Cowboy is my second favorite, and Whole Foods sells it...(do says the naked whiz) I was using it for about a year before I got my WSM. But recently I tried the hardwood lump from BBQ Galore (not to bore
) and like it better. I think it comes from Lazzari, but not certain...burns good and just seems like better quality lump to me.
For that matter, there's a bunch of folks who are happy using the Lazzari mesquite charcaoal, that stuff is plentiful in my area, but it sparks a lot so I prefer not to use it. I am not a big mesquite fan, other than building with it, that stuff is harder than a piece of cement though...but it looks cool!
One thing I will comment on lump is that it lights much quicker than briquettes do, in the chimney. I usually only have to leave mine going for about 10 minutes before I dump them in the WSM for minion style. I use a Stoker so that works out great.