Advantages:
1. Smaller and lighter than a 306duo (half the weight and about 1/3 smaller).
2. 2amp balance current
3. Don't know if it's true but people say it's more accurate.
4. Has capabilities of the 306duo when paired with an external discharger
5. Some places, like progressive rc, are selling the charger for $250. Cheaper than the $270 for the 306duo.
6. Shows charge and discharge capacity for each cell.

Disadvantages:
1. IMO the kickstand doesn't angle the charger enough for good screen visibility. I can see why though, the charge cables would get in the way.
2. Low internal discharge capabilities for those without an external discharger. A little less than half the current of the 306duo.
3. Scroll wheel isn't a smooth as the old design.