I am on OS .113 so I will give you my answers based on my own experience.
1. Yes, a great deal faster
2. Unknown about this, I do not mess with fonts
3. There is a sticky at top of this page that will help with this issue, on any given OS install
4. I get a day and a half out of mine (seems to vary a lot by the actual battery sometimes, not the OS)
5. Very stable, haven't had 1 single reboot since installing .113
Now I will say this last. Your mileage May Vary!