Take this with a grain of salt as i havent checked it out in probably 6-12 months.
I was in the 'beta' late last year, early this year? I have not looked into it in a long while. I see they finally have the console deal for the TV's, back then it was just run on any core2duo PC/Mac that was the only requirement and high speed internet connection. There is absolutely nothing downloaded, just there plugin, after that just purchase the game, let it buffer for a few seconds and play.
I could run Assassin's Creed 2 on my work laptop (dell d620) no issues. I got really turned off at the charges, because I was in beta I did not have to pay the monthly fee, $5/month I beleive was the latest I heard, it started at $10, and then have to purchase either playpasses, such as a 3 day pass, which gives you 3 day access to the game, or purchase it usually at retail price. Some games only had X day play passes usually 3 or 5 day play passes. I dont sit and play/beat a game in 3 days, usually play 1 or 2 hours a day, so that also turned me off.
Checking now, some of the prices went down. It ran quick, had a couple lag issues in the few hours i played Batman Akrham Asylum started getting severly choppy in places. It was nice when I was slow at work and until zScaler blocked onlive

Prices really turned me off though, I would rather just purchase the game and have much better graphic's. Never took long to buffer or anything of that sort. It worked pretty darn well, probably better now.