I like the Coshell briquets for grilling but don't use them for smoking unless I cut them with an equal amount of regular hardwood charcoal.
The Lowe's stores around here carried Coshell for awhile and it was very competitively priced, but they stopped about a year ago. I went into one last spring and the salesman told me that they sold the last of it for about $2 or so a bag...that really hurt!