Turned on my TP last night and it immediately started downloading ICS, which surprised me since it didn't give a choice.
When I upgraded my Samsung Captivate from 2.1 to 2.2, it was much more involved and had to be done through a pc. This was so smooth and easy, no sweat.
My son picked up his Nexus yesterday and thought he had one over me. I told him I now had ICS on the Prime. Ha!
In a couple of weeks, we're going to California for a week, of course, taking the Prime. That's one of the main reasons I bought it. It should come in very handy that week.