Servos
The PDS-2363 and PDS-2364 have the heatsink along with updated software. The update was the damping of the servo when it returns to center. The hold or control of the servo at center is better. The heatsink has proven to keep the servo more consistant over a longer period of time. The other features and specs are the same as the PDS-2343 and PDS-2344, respectively.
In testing, we have found that the regular servo (non-heatsink) will retain more heat and cause the performance of the servo to drop after about 30 minutes of continuious use. With the heatsink, the performance doesn't drop till about 1 hour and 20 mins. This is very usefull for you gas guys racing 1 hour mains.
-Robert