Yes, but it's not exactly the same as getting that nice HD signal directly via cable.
In my case, I have only VGA output on my laptop, not HDMI. So right there, I've lost a little bit in the translation. Plus, even a top-notch stream will not have the same refresh rate as an HD cable signal. And will there be hiccups in the stream from DirectTV's servers? Who knows?
So it's worth thinking about when you're looking at that $350 price tag. I may still pull the trigger anyway because it's still my best option, but you gotta admit that's a pretty stiff price for streaming video.