number one fan, thats for sure.
It doesn't fit directly on my ESC, but even when it sits 2 cm indirectly and pointing to your ESC it works very good.
before i had this fan, i had to disable my stoch fan from my ESC( It just didn't fit in my car). The temperature was getting to high if i ran a whole round (6 to 11 laps).
Now i can run 2 rounds without getting over heated, so if the heat is a problem... this fan can fixe it.