I did not know you could roll back to 8.0. I am not having any issues though so wont matter. But I am thinking of getting the Icon in the next couple weeks... What kind of issues? performance or personal pref?
For me, no major issues. I'm running WP8.1 on my Icon and there is a slight delay when waking the phone (about a second). My battery life got worse, but then I did a hard reset and did not restore from a back up. I've been having better battery life since.
Otherwise, nothing noteworthy for me. There are several other OPs that are having issues with WP8.1 on their Icons though. The majorites issues that I'm having are app related not OS related. My Onstar RemoteLink won't stay logged in and keeps telling me to accept the EULA every time I run it. There are a couple other apps that are kinda wonky right now, until the developers get them updated.
Oh. If you are used to using Glance, then expect to be disappointed on that. The Icon and the 930 do not support it. For me it wasn't that big of a deal, but there were a few who were rather upset about the lack of Glance support.