youngoldbloke
The older I get, the faster I used to be ...
^ get that impression too, glad I bought a pair of the 'old' ones when they were being heavily discounted not so long ago.It is a little confusing, the old ones do have the vectran puncture protection.
It does appear to be just a facelift/tarting up of the original 4000s, making no difference to the average cyclist like myself.