I've owned both the 527 and the 600. Both were excellent shooters but definitely made for different purposes. The 527 felt lighter and more balanced to shooting from the shoulder, which makes sense given the slimmer barrel and wood stock countering it. The bolt took a bit of tweaking to get running properly; out of the box it was very sensitive to the direction you pushed the bolt back, sticking if you were off a bit. The bolt handle, even the later one, came quite close to your scope when cycling.
In contrast, the 600 had no issues out of the box. The bolt handle doesn't come close to the scope and cycles as smooth as butter. The trigger is just as crisp, albeit without the set trigger of the 527. I thought I would have an issue with the synthetic stock, but its quite nice - doesn't flex, feels solid. Same with the plastic magazine, which I thought would've sucked compared to the metal single stack of the 527. But so far no issues. Only complaint is how expensive extra mags are even when fully plastic.
Overall it feels like Cz cut corners over the 527 but at the same time fixed a lot of the short comings, so overall it's a good side-step. Given the cheap price, especially on sale, it's excellent for 7.62x39 plinking.