The primary benefit to the Roe fan kit, in my opinion, is the fact that it will continue to cycle the radiator fan on and off even after you've shut the car off, until it brings the coolant temps down to an acceptable level. I love mine. It makes a HUGE difference at the track. Instead of having to put a fan on the front of the car between runs, the radiator fan cycles on and off to bring engine temps down for me. I can just walk away and let the module do all the work. A cooler motor means more HP down the strip.
Unless you are driving around on a 100 degree day where it may have to cycle on and off for over an hour AND have a weak battery, you won't have any problems. Never had a problem with mine. One of my favorite purchases.