RE: KO PDS 2413
I used these on my nitro cars, but had two fail. When I sent them both back to KO USA, they replaced them and advised that these were not recommended for nitro use (due to heat/design). This was from their service guy (via email).
I have always had good luck with Futaba servos, and the 9551 works great.
I am tempted to try the low profile Sanwa, as I just picked up the M11X (and prefer sticking to the same brand electronics)