I started using K-Comp a couple months ago and it's now all I will use in my WSM. Initially I was having issues with high heat, but I think that was due more to the fact my smoker was new and hadn't yet built up that good gunky inside. Now that I've done a dozen plus jobs, no problems with temps while using the K-Comp.
What first drew me to using it was the fact that it doesn't produce as much ash-- I was going to be doing a 12+ hour smoke and didn't want to have to worry about ash choking the fire out. At the same time, although it wasn't a big deal to me, I did like it that the K-Comp was all natural.
It's interesting-- I just started using some KBB (on my Performer) for the first time since I bought a bag of it with my WSM in March, and I notice that I don't seem to care much for the smell of burning KBB when compared to the smell of burning K-Comp.