NVIDIA SHIELD Review @ OCC
 

In the end, it's up to you whether you feel $300 USD is justified. For what the SHIELD offers, the price is more than acceptable, but if you don't plan on utilizing all that it offers, you'll be in for a tougher decision. Still, if you have a high-end NVIDIA PC or are planning on buying a new GPU, the SHIELD will make a great addition to anyone's holiday wishlist. Just don't forget to factor in an additional $39.99 for the official carrying case, because you're going to want that to.

http://www.overclockersclub.com/reviews/nvidia_shield/