If you don't want to run cable, sure you could try that.
But, it's tough (borderline impossible) for us to give you a 100% green light and say... Yea, it'll work. Sure, they work great in most situations but we have no idea about your electricity in your house. If it's a newer house and you haven't had electrical repair work done ... sure, it'll probably work.
Reason I bring this up is because I live in a house built in the 20s and currently am having the electric worked on. Right now there is one room that electricity isn't in any way connected to the same box as the lines in the living room downstairs. If I wanted to use that from my office where my cable comes in to the living room where my Wii is (for instance) ... it wouldn't work.
Best bet for you is to make sure that you can get it and try it with a backup plan in place. Make sure that you can return whatever you buy for a full refund. Don't shell out $150 on hardware that you are sure is going to work. Have someone make sure it'll work for you.
In general though, yea, those do work great.