The title about sums it up. I installed 13.04 on two machines a week before official release and had slight issues here and there. Several weeks later, I moved the rest of the machines over.
This was my first mistake.
Let me be blunt (for I can be no other way): the session crashes sometimes, for no particular reason. I'm just sitting there, minding my own business, when I start a program and BOOM - get sent back to the login screen. The weird thing about this is that it happens on more than one machine.
I submit the crash report, like a good linux user but thus far, no relief.
So be careful out there and make your own decisions on this.