I have about 150 of em! They are all good drivers. but you can ask many of the skilled individuals that are building them for my groove barrels. they are very easy to build (provided you have some skill with soldering) are pretty efficient and don't require a whole lot of voltage in order to work.
I ordered 2 sets 1 months ago and yet to receive them.
Sent PM to Dr. Lava but receives no response so I wonder if this product exists and the money I paid has gone down the drain....
Anyway, thanks for the info.... I just hope that I get some form of response from dr. lava :'(