I've been using the PS3 for a few Panther games so far. It isn't perfect, but manageable.
For instance, the picture is solid but not quite 1080. The other issue I have is if I don't toggle the controller every hour it will time out and ask to disconnect (more of a DirecTV.com issue than PS3). The only thing is when a lot of people connect to a single at once, the connection to the game struggles and the picture starts to go out. In time, it catches up and goes back to normal. Case in point, the Falcons game during the end, lots of people tuned in and I think the server got overloaded. Eventually, it was fixed after a few moments. Not perfect but if you can't get DirecTV, a solid alternative. By the way, I connect through an Ethernet cable from the router and not wireless for a better connection too.