I got tired of flats while out riding and switched to tubeless several years ago.
I got over three years out of my front Schwalbe tubeless tire before getting a flat that required a tube. The inside of the tire was covered in little hard blobs of sealant where there had been leaks. Then a couple months later, the back tire suffered a major leak but I was able to keep the tire inflated enough to get back to my car. I had neglected to replace the spare tube that I used on the front tire. I replaced both tires and have been rolling for over a year now without any flats.
Still, even with tubeless and sealant, I carry two tubes and a patch kit. And the patch kit is new and not full of dried-out patches that won't work. (that's another story)
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