Still runs fine with the CM base and ElemetalX since 24/8, it "feels" a little slower then AOSP with ElementalX.
But then Hammerhead was an absolute rocket with that combination and it might just be placebo telling me something is different.
I still get 3 days on light usage with calls, mail and some facetube stuff. All good.
I feel the communication about the switch from AOSP to CM, the whys and a propper announcement are the only thing you could have handled better and thats why its bothering some ppl.
The ROM is not the problem and still very good.