The thing with the Gatorskins is, for me, a) they seem to remain puncture free until the surface rubber starts to cut and allows flints to act directly on the kevlar breaker layer. This usually gives about 9 months/~3000miles of life and once they start to do this and puncture it's time to bin them. b) the Gatorskin side walls seem pretty good against abrasion, but any kind of sharp object will cut or puncture the side wall relatively easily.
Having said that I have had a couple of tyres that ripped/cut and had to be binned after only a few weeks of use and that's just bad luck. But with a bit of shopping they can be had for ~£17 so it seems like a reasonable compromise when admittedly better tyres, like the GP4Seasons, are going to start at £25/£30 a tyre.