So far I've had good luck with this update. Actually feels faster, nothing mysteriously crashing, and all the crap I had disabled stayed disabled. Too early to tell on the battery front.
I'm not happy about all the changes in Oreo... those stupid adaptive icons! (half of my icons just shrunk and got an unnecessary white border around them) This is the main reason why I switched to Nova, because on the AT&T variant you couldn't turn LG's version of that off. And the extra notifications.
I see we have LG's face unlock (we already had Google's) but I haven't tried it. Haven't really stumbled on any of the other promised LG goodies though.