Caveats aside, these are much better than stock cz75 sights - TruGlo Brite-Site TFX Tritium Night Sight set for CZ 75

The Meprolight tritium sights, on the SP-01 series, are the best stock sights on any handgun I've purchased. Ever. When I purchased the P-01 and Later, the SP-01 Phantom, it was a hard realization that CZ had taken a step down in the long distance aiming dept. The dots were extremely small and the "phosphorescent" strontium aluminate "glow-in-the-dark" sites were an abomination for those of us with aging eyesight. Day or Night! After looking into comparable sights, Truglo seemed the best option for replacing the stockers on my newly acquired Phantom.
The TFX series looked as good as the TFO's with a few added inprovements. I don't hose my firearms down with MEK's, so it may not make a difference if the fiberoptics are encased in acrylic or gorilla glass or whatever it is that seals them from the elements.
The sights, however, are as they are advertised. For my eyes, the tritium enhancement, through the fiberoptics, is great. The collimation of light during the day is exceptionally bright. Sight picture is excellent regardless of light or lack therof.
I had the sights installed by our local gunsmith, and subsequently zero'd for windage. the result?... a print that bettered the factory range print. Aim and point of impact were one.
Now, there is a small issue which may or may not affect your choice in purchasing these...

After installation, (at least on the CZ75 SP-01 PHANTOM) the sights have a gap between their fiberoptic overhang and the slide. Bothe front and rear. Does this affect their function? NO. Does it pose a durability issue? Possibly. The gap is large enough to slide a business card under. If your firearm were to be dropped upon the front sight, it's possible, that it would bend the overhanging part towards the slide. This would not only affect the integrity of the steel housing the fiber and tritium, but also the elevation accuracy. It's a small issue, but one that caught my attention. Sights that run flush are less prone to damage because they have a greater surface area of contact reinforcement.

If your CZ(phantom) is for home defense, these sights are, bar none, a head above anything available. If This is your truck gun (banging around in a console or underneath a seat), you may want to evaluate. If this is an open carry Hunting companion, these sights my be the perfect finisher.

If you have your own sight pusher, buy these. worse comes to worse you can hock the on online at minimal loss.
Personal rating 8/10 B+ (for CZ75 Phantom)