Great article in ZdNet today.
Logitech's Google TV debacle: What went wrong (everything)
My personal thoughts are iptv/web connected tv's are at about V0.2 of where real end users need them to be. You should expect at least another screwup or two before you start to see a real reason to buy.
i'd still prefer to buy seperate standalone devices rather than an internal to the TV bought o/s trust me on that one. The Yahoo iptv debacle has already proven that one.