Flats are caused by so many different things, and it's very difficult to know how likely any tire will be at resisting punctures. You can roll over a piece of glass, and it might not puncture the tire. And then you can roll over a similar piece and get a puncture. Conditions are always changing, and I don't even know if there has ever been a controlled test to measure puncture resistance. Even if there is such a test, anecdotes from forum members each represent tiny sample sizes compared with all the tires on the road and on bike shop shelves. If I get no punctures in a year, is it because of my tires or because of my luck? I have no idea. If I get three in a day, same question, same answer.

There is usually a tradeoff between puncture resistance and ride quality, and you have to decide how much to compromise each parameter. There are recent breakthroughs where today's puncture resistance tire rides as well as yesterday's protection-less tire. These new tires cost extra, and I would recommend them. I would not use a tire that makes the ride worse just because of the protection, but I'm just one person. Some people will tolerate a horrible ride just because the protection is there.