Howdy Mr. Big 54r,
I can not give you a precise answer to your question, as I never owned any of my CZs when I last attended one of these high round shooting schools. I did attend a 2 week school, and the second week consisted of a class of only 5 LEOs, all of whom were firearms instructors for their agencies. There were 3 Smiths, 1 Glock, and 1 Sig. We fired on average between 1200 to 1500 rounds per day through them. The only weapon that suffered a broken part was the Glock 19. That LEO had brought a spare 19 with him, so he simply used the second one for the remainder of the course.
I do not know what your round count is through your CZs, but if you have a reasonable count through them, personally I think they would do you well. If you prefer the CZ pistol, then why not use it. Just a suggestion to offer. If you have two identical CZ pistols (that use the same mag) why not bring a second as a backup weapon just in case you do have a part break. Or bring a Glock as a backup if you feel more comfortable doing that.
If I had the chance to attend such a school these days, personally I would take my CZ pistol and its mate as a spare, and never give it a second thought. I think that highly of the CZ pistols after buying 3. I will be buying more of them soon as well.
Good luck, and if you do take your CZ pistols, please let us know how both you and they did.
twoguns