I damaged the casing in both my tires on day three of the month long tour last year. I used Park tire boots on both. The rear boot had a wrinkle and caused more flats so I eventually replaced the tire, but I forgot the front tire was booted until earlier this year when I got a (unrelated to the boot) flat. I am going to use my touring bike on the indoor trainer this winter to try and use up that tire, but otherwise I feel it is perfectly reliable.