I use the MRC Superbrain 989, and although I love it and it is a great charger, I wish it was a little more powerful. For example, when I charge my TrueRC 4s 8000 pack. I set it to 8 amps, but it can only charge it at about 7.1 amps... I am actually planning on getting the 610DUO in the future, if the funds allow. But if I were choosing now, I'd go with the DUO.
