I have two stories and no ethernet cabling. I've looked into every nook and cranny to run a wire to the 2nd story, without it showing, and it's just too much work. So wifi solved it. I do like to venture from room to room as I work'n'surf. Just last week, my wife decided she didn't want an office anymore so she's moved back to one of the upstairs bedrooms. Wifi for her.
I don't know how I feel about leaving my wifi open. I do have the router set up to only accept traffic from the MAC addresses of the four computers that use it.
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