My SkyRC Programmer (PPM Monitor) finally arrived in the mail yesterday.

I just started testing the Radiolink Rx's and confirmed the measurements taken earlier by SBD, however I noticed that Gyro Rx was a little faster than the other 2 Rx's:

R4EH-G: Drift = 20us @ 58Hz (17.2ms)
R4EH-H: Drift = 17us @ 55Hz (18.2ms)
R4EH: Drift = 17us @ 55Hz (18.2ms)

I'm going to start recording all my other systems and will make sure to test various Rx's too... note that my tests above were consistent across 2 each of those Rx's tested (6 total Rx's in the test)

It's probably worth noting that I observed a range from 1000-1893us so 20/893 = 2.2% drift

Other radios tested:

BER-TRC1: Drift 4us @ 49Hz (20.4ms)
AuStar-AX5S: Drift 0us @ 49Hz (20.4ms)
Spektrum DX2E: Drift 2us @ 181Hz (5.5ms)
Turnigy 3XS: Drift 0us @ 62Hz (16.1ms)