I had looked into that controller but I had some doubts about it working with the temp sensor so I opted for the Derale. Someone else tried the Spal 16" from PCMforLess and is pulling it out because it can't keep up. http://gmtnation.com/f25/removing-my-pcm4less-electric-fan-3901/
I just finished fixing the A/C and adding a direct coolant sensor drilled and tapped into the water outlet for the Derale controller (instead of the radiator push in sensor). Haven't taken it for a drive yet but my fans can keep the engine cool with the A/C running with both fans at 50% in 28C temperature and air is ice cold. Running the fans at 100% just brings my high side pressure down. I have no doubt that these fans will work out well. My only problem is figuring out a steady 12V when the A/C is on. I don't want the fans to cycle with the compressor clutch.
If you need to add a temperature sensor, you can drill and tap the water outlet.