Love EMS .. I have a PS-2173 FET, its analog (0.09 S), where the PS-2143 FET is digital (0.08 S) but same torque.

Yeah they are fast hey, I had (HAD - It died) a Hitec ultra torque 645MG and it was very slow (0.24 S) . The Ko server is HEAPS faster and torque is rated only 1.41oz less

To be fair though, I paid $85 for the hitec (hmm though some aussie shops have them at like $120 +/- ), The Ko cost me around $155 I think.

I expect the KO to last longer then 30 hours of use though unlike the hitec.