It will open ESPN 3, though it struggles some with it. More of a problem with ESPN's horrible site design for a video player than anything on that front. Hopefully that is one of the issues resolved when the apps start coming out. An ESPN 3 app would work quite well on GTV.
Chrome isn't a bad browser, but it's been stripped beyond belief to run on GTV. While it offers picture in picture between a web browser and your TV feed, you can't open tabs in Chrome and have to hit a button to bring up the address bar. Also, everything appears in full screen. Would be nice to offer a split screen between the browser and home menu or have at least one tab available.
I have the logitech version, which is actually pretty straight forward. I'm thinking that a couple software updates and the app store will improve the performance of what is essentially a pretty specialized media pc.