I was actually quite surprised at how well the upgrade went @jonathanmundy
Usually I upgrade - allow all files (and Mail etc) to get updated to the latest OS - carry out a full back up - then clean install.
But on upgrading I've found the system to have actually preform or feel snappier. I've lived with it now for a couple of months and I've only encountered two bugs:
- Sometimes Safari stops working properly where it ceases to acknowledge hover state
- The find feature in TextMate 2 seems to work only intermittently
I'll probably do a clean install at some point, but on the whole, it's been a decent 'upgrade'