I bought two of these TGZ380 from China (online, Shopee) and they both are working fine on each of my 450s. I even use one with only a satellite RX (Spektrum). One of my servos (PIT) did jitter but I simply replaced that servo and had no more issues since. My swash servos are cheap JX PDI 1109MGs and they're powered by a stand alone 5A BEC not the built-in BEC in my ESC.