Not too many *major* issues, but running into minor annoyances (I just had my screen shut off on me randomly just now) do occur. As for Glance, it's there, working, but getting it to work is *interesting*.
If you've got it working on 8.1 and you don't hard reset when getting 10, then it's all good. If you do hard reset, then you need to get SysApp Pusher and redownload (if it's not in the setting's page at that point, just use the app to go back to the store, and the new store can actually open it as well, which is cool).
Hope that helps! I'm actually liking this build on my Lumia 920. :)
07-11-2015 07:46 AM