I've ridden 6000 miles on my Michelin Pro 4 and power endurance tires and haven't flatted yet. My wheels are not tubeless ready. Going tubeless isn't in my future.
One of the most recent complaints I've read was not being able to break the bead in order to install a tube for a bad puncture. If you have to carry a spare tube, plus a plug kit and some extra sealant, it doesn't seem worth, unless the roads you ride create a lot of flats.
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