I use a Gillette Fusion razor. The heads are pretty spendy, but I balance it out by using them a long time. I generally shave with it 5 days a week. They recommend replacing the head when the green strip turns white, which is no more than a week or two. I used to use mine for about a month before replacing them, now I go several months. I think I've been using the current head for 6 months, I'll be sure to mark it on the calendar the next time I replace it. The shave quality goes down a bit with each use, but it seems to level off after a couple weeks.
I also have an electric razor that I use on the weekends when a close shave isn't required and I don't want to look scraggly.
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