I've got a 20 ga CZ Bobwhite, bought new this year. While it's a nice enough gun, there are a few things that stand out. The bluing quality is questionable, although it finally seems to have stopped coming off when I wipe it with an oily rag. One cross pin in the receiver kept shifting side to side, I staked the ends lightly to stop it from moving. Kicks harder than you might think for a 20 ga with light field loads, and trigger pull is quite heavy. Fit and finish is so-so.
Overall impression, I wish I'd maybe bought a used 20 BSS Browning I saw for $1k at a gun show locally. So, don't expect the world if you buy the CZ, it's what it is, which is a new sxs for less than $700.
Having said all the above, it's gone "bang" every time I pulled the triggers, the extractors work flawlessly (I much prefer them to ejectors), and I shoot it reasonably well, so it's not all bad. The recoil pad is odd, it's a mix of hard plastic at the heel and rubber at the toe, and is curved, so a replacement will either have to be flexible or the stock will need to be squared to fit the new pad. Wood finish is "muddy", one reviewer likened it to smeared peanut butter. It's not that bad, just not spectacular.
Don't buy one sight unseen, this is a gun you need to look at closely and handle before you buy. Shoot one if you can. The Yildiz is much the same, I've looked at some of their over/under guns and had the same impressions.
I just bought an old SKB 500 O/U, very different feel and finish quality. The Japanese, as always, do what they do very well, the Turkish gun makers fill the gap between them and the Chinese.
This is, of course, simply my observation and opinion. Others will disagree, that's human nature.
I guess the best analogy is, you're getting what you paid for, they're an honest gun.