Myself and JerryN from TVWB and a guy named bbqBob split a pallet about a year ago. I have found that it burns longer and with less ash then Kingsford or any lump I've used. I have not found that it burns hotter, you can control your temps with it just like with anything else. It has an intersting flavor when firing up but nothing that I can detect on the meat.
I give it a 8 on a 1-10 scale. The only downsides are price and availability. I only use it now for long overnight cooks. Longest burn on one full charcoal chamber on a WSM was 23 hours, and I probably could have gotten another 2 or 3 from it.