Well currently the beta testers have pretty much give good reviews about them on the forums. Well, that's assuming they did get an
invite. Though they said that they're only performance testing right now. Also, they're only targeting the NA servers right now. There was a QA session and a guy from Australia asked if they would be getting any lag and the person said that they have tested it in australia and it was a half a second lag. I still think that's pretty good, unplayable but pretty good. And I'm sure if this is a hit they'll find a way to reduce lag or maybe put servers in other countries. Heres an
image of the servers they have. Though, that was in April so they might have moved or added some new ones. Looks like I wont be having any lag when it comes out

Also,
here's a review of it. Sounds pretty good. He was playing a
multiplayer FPS and didn't see any lag. Also, with onlive macs will now be able to game. Good thing for them. And
here's a list of their partners.