A fellow drag racer has the first iteration of the HC charger and it's decent for the price and a good choice for 2S and 3S packs as mentioned before. Somebody who doesn't know how to use it plugged in a 3S pack and charged it as a 4S and destroyed the battery. I think it had an "auto sensing" feature that didn't work well at all, and looks like it has been removed from the newer version.
My charger of choice:
http://www.fmadirect.com/detail.htm?...247§ion=72
It will charge two 5S packs at once, or single 6S to 10S packs at 10A Max (260W continuous max output). What's really cool is it lets you hook up two packs of different mAH, C and S count and will charge them both together. Charging the new chemistry lipos at 3C is a cinch with this beast. A little pricey, but I am glad I bought one. Plan on getting another one or one of their 4S chargers to complete my raceday equipment.