I had bad experience with it. I recommend it only after a little modification.
It is indeed two 6-slot charger in one case.
At the beginning everything was ok. After some months some slots were not charged full, they stopped e.g. 1,28V or did not went into charging at all. Others were overcharged with the 700mA rate all night. Killed most of my rechargables. Apparently the charger did not realize -dV of batteries.
Then I took apart the charger.
There were four 4-pin connectors between the boards inside, that could not cope with the big current that was needed for charging all the cells at a time. Parts of the white plastic connector became dark, because of the heat generated by the big contact resistance of the connector.
So I bypassed these connectors and soldered the wires directly in.
Since then it worked again, now I am happy with this charger again.