It's impossible to give a fair assessment of these tyres for their puncture-prevention properties, as you either get a puncture or don't, but in theory the additional layer (although it seems to be pretty thin) should help out even a little. They should have a bit of resistance against the dreaded in-town/under-railway-bridges glass as I can see these crunching straight over small pieces, however I highly doubt they'll stop any rigid sharps (i.e. screws/nails or metal pieces) from piercing straight into your tube, especially at the back on the weighted tyre.
I have however frankly given up expecting any miracle cure for punctures, beyond giving up actually riding.
A criticism I do have is how tight these tyres are. I purchased these specifically to fit my wheel and rim size and boy have they NOT left any margin. I won't say I struggled massively to get them on the rim, but I had to use a bit of force and was wary about pinching the tube. Even when fitted I had to deflate the tyre partway through inflation, as the tyre was now coming out of the rim. They do seem to be a tight-fit when on, which conversely can be a good thing as it should reduce dust/dirt getting into the tyre, but should I ever get a puncture while way out on a trail I can't see myself smiling at the prospect of wrestling one of these things off and back on.
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