For 2000 - 2100 mAh cells, that charger should be fine. But, Maha recommends (in the C9000 manual) that you charge cells between .5C and 1C (C=total rated capacity of the cell).
The fast mode on the 401FS gets cells too hot, period. The slow mode charges @ 300 mA, which is .15C. So, your charging quite a bit below the recommended .5 C level. Some will argue that it charges fine on slow mode even well below .5C.
Previously, I used it to charge 2700 mAh Sanyo cells, and it seemed to work fine. After a few charges, the middle cells would continue charging for quite a bit longer than the outer 2. The cells were all used in the same device, so I doubt the middle 2 were drained further than the outer 2. It could have been that these cells were missing charge termination, but I can't prove that.
If you go with the C401FS, I'd suggest not using fast mode.