Heard lots of good things about the B6 as well, though I don't own one.
Although I do have an expensive LiPo charger for RC batteries, and have owned a few other brands which turned out to be crap, I also picked up a couple of these and have had zero issues with them, recommended even though they are inexpensive:
http://www.hobbyking.com/hobbyking/s..._US_Plug_.html