Yeah, for manual control I think it comes down to a choice of three:
* That Enermax one
* The Superflower / Akasa one
* Coolermaster's Cool Drive 4
For me I decided on the superflower because it's cheapest, has many faceplates and led colours, and looks better than the enermax (imho). I didn't like the enermax 'cause of the led situation, and I'd prefer to only have one fan speed / temp displayed at a time. However the enermax does have a greater voltage adjustment range, but this comes with the problem of the alarm going off at 1000rpm for the fans - too high for some 120mm fans. As for the cool drive 4, I'd prefer to be able to control any fan at once (don't like the one dial for them all), and also the dial (apparantly) isn't very sensitive. As such you have to turn it about 4 times to go from highest speed to lowest, and I'm sure that'd get very irritating.
Anyway, as I said before, I think it's mostly a personal decision on looks and controls for fan controllers.