I like tubeless. My favourite experience with tubeless was discussing the subject with a fellow rider as we rolled along through the glens. He was asking whether I thought tubeless was a good idea, when suddenly sealant started spraying out of my front tyre... and within a couple of seconds, stopped. I think he was sold.
My least favourite experience with tubeless was within the first 20km of a 600 when I had a puncture that wouldn't seal. Luckily, even when riding tubeless, I always carry a spare tube or two for just such an occurrence. Fitting the tube was a bit messy, granted, but I finished the ride with no further issues.