This Year Wi-fi for All, At Least All Over

When you have a large house (or a house with concrete walls), getting an effective wi-fi infrastructure is hard. You can use power-line extenders, but they don’t always work. I’ve heard on some of EEro as a solution, and I found this interesting article describing Eero and how it works. It sounds like a good idea, but it is awfully expensive at a starting price of $499. How do I balance the pain of the power-line extenders with the cost of an easy to use system?