I am sure they have their purpose, but then I have never had a servo feel overly warm after a race. So i see no need for them.

You can also check out the hitec titanium geard ones, they are fast and plenty of torque and have a heat sink and can be had for around 99.00. Alot of people have had great success with them. I have one in my box NIB I keep as a spare. Also if you are already running a hitec you wont have to change your servo horns.

Also if you go to amain hobbies they have Ace servos, and they are suppose to be really good and are like 75.00 and 95.00 deoending on which one you get. I am almost sure Joe t runs them in his buggy and his LSP.