I am thinking of adding a computer upstairs in our house, but the router is downstairs.

I was looking at Wifi, but I found this Powerline network system which seems cheaper and more stable

http://www.bestbuy.com/site/Actiontec---500-Mbps-Powerline-Home-Theater-Network-Adapter-Kit/5215483.p?id=1218625358741&skuId=5215483

or

http://www.bestbuy.com/site/Tp-Link+-+TL-PA211+AV200+Mini+Powerline+Starter+Kit/4359873.p?id=1218475570165&skuId=4359873&st=powerline&cp=4&lp=5

These looks really good, no new wires, just plug one powerline adapter into a power plug near the router (correct?) and the other on plug in a socket near the computer.

Seems like a simple set up, and they say 500 Mbps which seems fast, good enough for gaming (right?)

Look like there is a lot of adapters to choose from, but some are HomePlug certified, and some are not (the above are).

What is this HomePlug certification, is it important?

Is HomePlug certified faster?

Anyone using Powerline, and how do they like it?