Never heard of them before, but at $24.95/plug x 16 plugs for the HEMI thats $399.20 just in parts.
IIRC, the power contained in the spark doesn't really affect things significantly anyway - but I could be wrong on this anyway.
I also have concerns with the graphic that indicates that resulting combustion exhibits a fair amount more pressure on the pistons. . . I'd be concerned about engine durability there.
Bottomline, I'm staying away until I hear from someone I trust these are worth it AND the price comes down at LEAST 50%.