Cobra Fly Z S - what does the S mean?

Looking online, I wonder if it's for 'starter' as it seems to be a budget line available at sports direct etc.

Visually it looks like a fly z, but I wonder about its materials and construction compared to the original.

The original was well regarded and is widely available from reputable 2nd hand sellers such as golf bidder and less reputable (!) ones like the bay. I doubt you'd pay more, and probably a bit less, and at least you'll know that it's the 'real' thing and be able to move it on should you need to.

Speaking of moving things on, by coincidence I have a lovely red fly z which i'd be willing to exchange for £50 if you are anywhere near East Herts...