I have the Duo's cousin, the 0610iNet and also own an Ice. I find them both different, but both easy to use and pretty intuitive. The biggest complaint I see on the Hyperion chargers is lack of a good manual. The manual is a 6 pg document you dnload off hyp website. The Ice manualis a nice booklet and provides a lot of background and helps you understand whats going on with a particular battery chemistry and its charging.

There have been 2 firmware updates to the 0610INet and Duo chargers adding features, increasing safety and providing more detail from the charging process. This is a feature the Ice does not have and makes the 0610iNet and Duo chargers capable of being even better chargers in the future with further improvements in the firmware.

If I had it to do again, I'd the a Duo, my thinking at the time was the 0610iNet would give me 2nd charger with my Ice so I could charge two batts at once. I still run a lot of NiMh, so its no big deal and I now can easily do two pacs at once with the 2 chargers. But as I seem to be shifting more toward lipo, I would rather be doing those with Duo.