I am not affiliated with NitroPro so I can't say with certainty, but my understanding is that NitroPro special ordered servos with specific upgrades to the internal components exclusively for NitroPro. I know that AGFrc offers a custom service to anyone who places a minimum order to customize servos to include any custom specs included in the order so I would imagine there are other servos out there which mirror the CT(x) specs but I don't know which brands/models have the same specs as NitroPro. All I know is that NitroPro has put a lot of effort in perfecting the poor quality designs from AGFrc branded servos.

Someone mentioned earlier in this thread that they believed the A81 series were significantly improved after I was burned on the A80 series, but NitroPro is now selling the CT3 so I have doubts that AGFrc is staying current with the latest offerings from NitroPro. It's more profitable for AGFrc to use less expensive components with no warranty support.

I realize that AGFrc claims to offer a 1 year warranty but they rejected my claim saying that I abused the servo because I used it for racing competitively on a race track. Just that alone made AGFrc dead to me.