If they work for you, great! I've never owned one that shaved anywhere nearly as close as a blade, or that I didn't have to use twice a day if I wanted to be clean-shaven in the evening. Plus, I don't particularly find them comfortable, or precise; they're all a little bit like using fine-grain sandpaper.

But everyone is different, and if you like the shave, you're fortunate.

For years I carried a AA battery powered one in my glove compartment for emergencies, like when I was in a rush and had to shave on the road. It was an absolutely horrible shaver, but better than the alternative. I only used it a couple of times within ten years, so I stopped doing that.