1. Surface Pro 2 Battery life has TANKED. It's now sub 3 hours and nowhere close to the all day computing experience I had with Windows 8.1. Had a fully charged device last night, put it to sleep overnight and this morning it was down to 11%.
2. Touchscreen is less responsive, especially with Edge.
3. Edge pages take forever to load. IE is faster.
4. Outlook emails don't send - they just sit there in the Outbox.
5. Surface Pro 2 runs really hot all day.
6. Bluetooth - turn it off and it turns back on - BY ITSELF.
7. Bug in Edge - sending replies in Facebook corrupts text.
8. Notifications in system tray lights up but if you tap it, there are no notifications.
9. OneDrive app permanently deleted the wrong sheets. Permanently.
10. The upgrade process was a train-wreck so had to clean install, meaning re-synching 100Gb of OneDrive and eating my data allowance.
Now I have drunk the Kool-Aid for many years and still promote the products but this to me is worse than Vista and I'm seriously contemplating a roll-back to 8.1 which, after so long in anticipation of 10 makes me sad.