And one dissenting viewpoint (this IS ECF, after all).
I prefer the S. I have no need/use for temp control though. If you do, go straight to the M and don't look back.
If not though, the weight difference is significant, and is a difference maker for me. So there are SOME out there who actually do prefer the earlier model. Or, better stated, at least ONE (out here...).
Both are pretty dayum awesome though - make no mistake about that.