It kind of depends on what I'm doing. For a couple of years I commuted to SAN, and would fly home on Thursday night and WFH on Friday. If I've had a heavy travel week I would do the same thing. Getting home at 6pm (or later) on Friday night sucks. I don't really have an option now since I'm site based.

My biggest problem with WFH was that my wife and daughter thought that I was off work for the day, and would get asked to "just take a minute" and help with something.