Not too sure whether there's much of a difference between the piezos used by 682Drums versus anyone else, but I can attest to the quality of the conversion materials they provided me for my Alesis e-kit. The cones are of higher quality than the foam I could find in stores and are well milled. Using their kit, I was able to convert my stock drum pads -- which used mylar heads and a reflection plate type trigger -- to mesh heads with a cone trigger. Prices are reasonable too, here's a video I did to demonstrate the cone converted pads versus other mesh head mods on my DM10.
- Reggae Mangle