I have had the charger for approx 3 months.
Charging and balancing.
No problems with the charger.
I did make up a better 12V input cable.
Check out the link below for a long series of posts on another forum discussing the charger. RC Flying.
http://www.rcgroups.com/forums/showthread.php?t=886698
(Note I also have and use Duratrax ICE chargers and a Orion Advance Flight Charger. Both good units but no balance capability).