I've never tried one and I never will because of something I witnessed about one year before I quit drinking.
I was with a coworker in another city for about 3 days on business. He had told me on the way up that he was not drinking and that I should do as I please while I was there and not to worry what he was doing. He was my boss. I would normally have dinner with him at least anyway and still planned to.
The first night we met a bunch of people at the same seminar at our hotel during happy hour to make plans for dinner. He ordered an O'Doul's. There were probably 8 people at our table. When the waitress brought the 2nd round, she forgot and brought him a regular beer. I watched him look at it and make a very half hearted attempt to get her attention. And then he drank it. I ran into him about 6 hours later as I was closing down the hotel bar. He was hammered.
I'll never order an NA beer. It's just playing with fire in my mind.