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I have several CZs, including a P07 (polymer) and the classic 75B (all steel), and have never had any of them upgraded. I did replace the sights on one, because I wanted something different, but did that myself.

I own dozens of guns, and have shots dozens of others belonging to my students. The 75B will beat the pants off all of them right out of the box, and the P07 will beat most of them. The only thing that comes close is my Dan Wesson 1911, and that cost close to $2k.

You have to shoot a CZ to appreciate it (like driving a Mercedes). It is professional grade. There's a reason it is the preferred sidearm for European police forces, and African mercenaries. Shoot one for 30 days and you won't go back to Glocks or Springfields.

Welcome to the club.
CZs are better out of the box than many tuned guns. CGW may have some suggestions, but the most common upgrades are triggers and sights. CZ triggers are already great, compared to a Glock, but some improvement is nice. The stock sights are not great, so I have often upgraded those.

I have not used CGW, but by all accounts, they do great work. Of course, they have a great platform to work with.