
Personally I find it very usefull and don't really have much negatives to mention

You will quickly be able to see if it works though.

It does require some setting up, to get the most out of it. It is free for 30 days with full acces to all features. If the other fans are actually connected to the motherboard or a fan controller, but you are just not able to control them, I'll recommend trying Argus Monitor If the fans are connected to your PSU alone, I don't see how it would be possible to control them using softare. SpeedFan is popular, however it hasn't been updated for a number of years, and I ran into problems with SpeedFan as it was not able to read the sensor chip on my current motherboard.
