I would strongly suggest you read up on how the stepped fan controllers work. They can only vary the fan speed in discrete steps and they can only slow the fan down to 5v speed (roughly 50% of full speed).
The T-Balancer runs at 12V all the time, but varies the frequency of the supply so it can actually stop the fan or turn it over at 1RPM if it sees the need. Through the control software you can determine how the fans react to changes in temperature and you can link multiple fans to 1 temperature sensor.
For example - if you are monitoring the CPU temperature, then with the Akasa or any other stepped controller, you need to control the CPU fan to quieten it down or improve the cooling. With the T-Balancer, you can turn up all of the fans in the case, at different rates if you want. Try it - you will be very surprised at how extremely effective it is.