I've not tried it, but a friend of mine had a go. It's a very good way to block off the outside world and focus, however I'm not sure it works to keep everyone happy. Studies have shown it relaxes people and in some cases helped control out-of-control anger, I'm not sure there's been a study on the happiness. However saying that my area for happiness glows when I have a Subway, maybe having a Subway is also a form of meditation, my point being it's what makes you happy, and being completely relaxed and shut off from the world can relax you and you like being relaxed, you're happy.
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