There is more than one eCCPM. When the ad says CCPM it usually means 120deg CCPM which is three servos moving a swash plate with balls at 120deg. An equilateral triangle. The latest thing in CCPM is the 140deg design. It places all the ball joints an equal distance from the main shaft in in a fore-aft perspective. The proposed benefit of 140 is that for elevator changes the servo response speed is equal between the front servo and the the rear servos. It's something only FAI flyers would appreciate. Apparently, with 120 there is a slight change in collective when making a sharp change in elevator. 140 is only supported on high-end radios.

Also, according to my radio, there are 90deg and 180deg CCPM modes too. I don't know anything about those.

-Mark