I've been running the Tech Preview since it was released and really have had no catastrophic problems with Logos.
Occasionally is takes quite longer when loading in comparison to Win 7 or Win 8.1, but runs smoothly once open.
Smart Tags seem to work fine with Word 2010. (Noted since another user reported them not working in the beta)
The only issue that seems to be consistent is the indexer crashing, so I've attached the logs. Hope it helps in preparing for Windows 10 compatibility.
3324.Logos Log Files.zip