The same advise applies to Geco as applies to any other hot ammo. Geco is loaded to 'normal' pressure/velocity for the European market, so 9mm pistols that come out of the European market like Berettas, Glocks and Sigs were designed to work with that ammo.
While it is perfectly safe to use this ammo, it will accelerate wear on the firearm. TANSTAAFL.