Likely a lot more users of the non-EC version. A lot would be in common between EC and non-EC, of course. I think there's some consensus that the encoders are not so great as to be worth the extra cost vs the non-EC, which keeps the number of EC users down (but I have no direct experience with the performance of the EC version).

There is (or maybe was?) a weirdness if you use an rPi, in that the CEM40 uses a usb-serial chip that does/did not have the correct driver for rPi. I used a non-powered usb hub in between the pi and the CEM40. I actually still use the hub even after switching to a mini-pc, because I just swapped the pc in. Maybe some day I'll take the hub out

Otherwise, not much in the way of Ekos/SMate issues. If you want to park at the NCP, you need to "find home" then manually slew just a tiny bit off from home and set that as Park, else it is prone to getting confused about where to park.

Performance of mine has been excellent. Consistently guides below 0.5" RMS when loaded with an AT130EDT.

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