Bugs glorious Bugs!
The one that has made me ditch it is the UI becoming unresponsive: start playing timeline and it wont stop. (Trying to grab the playhead or hitting space does nothing for 10+ seconds).
Editing a brand new v15 project using cineform movs, and nikon h.264 files (very editing friendly, usually) gave me a crash every 15-20 mins.
Here's a helpful post that I reckon a lot of people will need in the next week or so
https://community.adobe.com/t5/premiere-pro/open-premiere-project-in-older-version-downgrade-project...
*note - rollback to v13 didn't work for me, v14 did.
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