The Clone VX is Macdev's high end spool, preceded by the Clone (non VX) and the Droid. Droids are basically the precursor to the Clone, so their drive systems are similar.
There are two main types of Shocker, the Shocker SFT and the Shocker NXT. The SFTs were the earlier years, and the NXTs were more recent, as late as 2009. The NXTs came with a better bolt than the SFTs, as well as more updated boards, etc, but these days, whenever you look at used shockers, about 90% are upgraded to the hilt anyways. If you've got more detailed questions about the Shockers, stick your head in the Smart Parts club, as there's a few guys in there who know just about everything there is to know.
Edited by andrewthewookie, 09 January 2012 - 08:02 PM.