gearspeed and synchrotech are basicly the same. i forgot which one was first but which ever one it was one guy quit and opened up the other one.

they buy the pieces from honda and the carbon coated ones are something they do to it. i used both of them and they are fine. now i only buy from the guy on ebay because its cheaper than actually going on their website or calling them. if you are going to replace your synchros i would look at the synchro springs to make sure they are fine because a good chunk of the time, thats usually the first thing to go.