I had the Shield Portable and loved it. Sold it as I am struggling lately on money and I did not use it as much as I could have... but I did really love it.
I do not think the Shield is quite ready for in-home TV based gaming. It hedges on a few PC ports, PC Streaming, and GRID Online Could Gaming. But it all works really well if you have the right PC to stream from and/or if you alos ahve a really good internet service and router to internet stream could gaming.
BTW, for anyone in the US as there is no US links above:
Regular:
http://amzn.to/1Oufk1v
Pro:
http://amzn.to/1MlCSB8
Remote:
http://amzn.to/1GCCCvC
Stand:
http://amzn.to/1LdQkan