In comparison which charger does anyone find to be a better choice, Opus BT-C3100 V2.2 Charger or The NITECORE UMS4 Intelligent Charger? I own an Xtar VC4 but this charger I feel did not live up to all the hype about the whole quality issue. I had it for 5 years but six months after I purchased it, it gave me nothing but problems. I'll never buy anything by Xtar again. The two I mentioned for comparison look pretty sweet on the specs and all but I just can't seem to make up my mind and I hate to fall for any fake hype about quality again. Anyones who actually owns the Opus or Nitecore chargers I mentioned opinions or experience with these chargers would be much appreciated.