Deacon Blues is right -- use only CZ factory or Mec-Gar mags (I've had CZ-USA actually ship Mec-Gar mags as "factory" mags). The cheap after market mags are worthless.
We've got two early model CZ75s (no "B"), one made in '84, the other in '85. My wife's gun was basically "New Old Stock", but mine had been around the block. I had some failures to feed right after I bought the pistol, but that was corrected with a Wolff recoil spring. I have also had some ammo related issues, but that was from a batch of junky old Norinco 9mm that was best reserved for blasting through a MAC, otherwise they feed anything I've thrown at 'em.
We love our CZs, and I trust them enough for my wife to have one as a self-defense piece. From everything I've read, the "new" CZs are just as good as the old. I sure wish they hadn't gone to that ugly "everyone's doing it" squared off trigger guard. I keep looking at the stainless models and wondering if a good 'smith could recontour one!
We have the Kadet top (got it for her) and it was a bit finicky at first, but there was a design change and CZ-USA sent us a new firing pin (free).
Great pistol: accurate, reliable, classic lines. Great company: good customer service, parts availability. Give them another chance.