I am very pleased with the SONY Google TV. It does Netflix and PLEX very well.
SONY updated the firmware the other day, and among other things it corrected the USB HD crash problem I was having.
I am in the Montréal area, subscribed to Vidéotron cable TV. The SONY allows me to switch from Internet to TV with a single button, and the Vidéotron program guide is just another button click. I can click another button to place the cable TV in a small window while the rest of the screen is Internet functionality. I haven't touched the Vidéotron remote control since I got the SONY set up.
Another advantage to the SONY is the support. They have online voice and chat support techs in Toronto who are available during normal business hours.
The only downside I see to Google TV in Canada is there is no real integration of internet resources with cable service. If I use the search button on the SONY remote to search for "Rick Mercer Report", for example, it takes me to cbc.ca where I see that it's on Tuesdays at 8pm, but it doesn't take me to the cable guide.
Other IPTV apps that work well on Google TV are:
REDUX TV (http://redux.com/tv
) - curated "channels" of great stuff to watch
Mitty Torrents (mitty.co) - a complete solution for finding and watching movies
The SONY is available at BestBuy for $170.
The Netgear GTV-100 looks like a nice machine, but the support is not up to the SONY Canada standard.
I hope that helps you decide whether Google TV is for you