Well, I ran across the William-Sonoma 3.99 deal last week, just before a trip to KC. I bought a box, just to see. I took the box at its word and built a fire with 12 briquettes...according to them enough to cook for two. What a joke. After 5 minutes over that fire my burgers were just barely brown (more like gray). Unless I'm missing something, there's no magic in coconut briquettes.
I may try them on their own again, using what I feel would be a normal fire load More likely though, I'll mix it in with my standard Ozark Oak lump, until it is gone.