I have owned both the CSA and CZ 858 and they both ran great, the CSA came with the bolt tabbed (so no slam firing gremlin) and a nicer finish. The CZ 858 came with more mags and was cheaper, I have owned two of the 858's and I never had any issues with slam firing. I fully intend to keep my CSA VZ 58 and add one of the new CZ 958 to the collection. You can never have too many variations of this fine platform.