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I've had the pleasure of using a MiBoxer C4 and C2-3000 and although the C4 is a pretty capable charger that has LiFePo4 capability and has four bays, it is only slightly better than my "Go-to" Nitecore chargers.
That being said, I really like the C2-3000, especially the LCD screen and the information provided to keep me informed about the charge. Excellent charger except that it doesn't accept LiFePo4 and it is limited to two bays and it uses a 12v USB wall wart and USB cable for power. Not a deal breaker but kind of a problem if you misplace the cable? Build quality is excellent in this version and though not as flexible as the C4 it is dead easy to use.
I see the C2-4000 is being released for testing and it has LiFePo4 capability, cool! I can't tell what power adapter is being used though.
Finally... I have a request for MiBoxer. Build us a C4 version of the C2-4000 and I'll buy one and give away all of my Nitecore products for good!