The fingerprint scanner went out on mine pretty soon after the update. The replacement was a little better, but I still couldn't get a whole finger scanned (and I usually do at least 4). I have a replacement replacement coming now, and if that doesn't fix it, they'll send me a new one. (The warehouse is out of stock on new Pixel 2s - I'm hoping that means no more production and I'll be "forced" to "accept" a Pixel 3.)
Otherwise, better battery life with Pie. Pixel 2 and never put betas in it. The update was OTA (unlike a lot of previous updates, which I've been doing Deuce flashes for).
No Xposed yet on Pie. And the Simple Analog Clock doesn't show (but the widget's there - I can long-press it and get the menu). It showed on the replacement. Strange. (Also TWRP 3.2.1.2 works fine on this one -but it, and 3.2.3, failed to decode on the replacement ... which came with 8.0 and wanted to update in a few minutes. Unfortunately, I didn't remember to look at the date of the last update on it.)
Well, we'll see next week, with replacement 2.5. (Why 2.5? The daily driver is a replacement for a bad OTA update back around February, so I'll be on my 4th Pixel 2 next week. Still, no complaints)