I think probably the best bang for the buck charger on the market right now is the ICE charger,the MM's are really good too, as are the GFX's,I think I would steer away from the Integy line when it comes to chargers.
I have a 16x7v6.. I love it.. i bought it used last year.. I have not had any issues with it.. it also discharges at 30 amps which is great.. I got it bacuse i was tired of hauling a power supply around.. The only downside i have is the fans are very loud.. besides that it is great..
I have heard guys at the track who have the same one as i do say they dont charge or peak right.. I personally have not had any issues.. I'm going to be picking up another one, or a 16x8 version.. basically the same charger but has a motor checker built in.. .