I have a friend with one. He hasn't had any issues with his. He wasn't a fan of the included mags, but I have a couple Sig 1911 mags I got for free, and they work fine in my Springfield.
Whelp... I'm stumped... Thats a new one for me, as I am unfamiliar with Zig.
So long as they use a GOOD forged or cast frame and slide, to proper specs, you should be good. All the other parts can be replaced easily if there are issues.
The Zig 1911's used to be sold as Regent Arms 1911's by Umarex out of Arkansas. They are made in Tisas Turkey.
I had one of their 4 inch versions and it shot and functioned perfectly. But I traded it off because of the inability to get replacement parts for it through their company. And by company I mean both Umarex in Ark and their Zig Factory outlet in Florida. Got nothing but a run around for over 2 months before they both finally informed me they couldn't get replacement parts such as recoil springs. And in the case of recoil springs for that particular pistol, it was a totally proprietary system that no one else made springs that would work in it.
To me a company that won't furnish replacement parts for it's products is simply unacceptable.
Seems like a good base platform to work from. As a full size, so long as there are no deviations from the standard specs, replacing parts will not be an issue.
Upgrades are pretty easy... You can do the safety and grip safety with little effort.