I have the older brother of that one, the 452 American, and its a good rifle. CZ makes quality rifles for their price point, you shouldn't worry about a dud.
But with that said, it has been my experience and stated here many times in other threads that there is no match quality .17 HMR ammo. Accuracy? - can I shoot a squirrel at 100yds, most likely yes. Head shot? - depends on the ammo lottery.
I've had boxes of the Hornady ammo where it was cool to blow up plastic drink bottles by shooting them through the cap at 100 yds, the next box 1.5" - 2" group is tops.
In other words, I wouldn't be fretting about getting a lemon rifle, it's all about how many different types of ammo you can get and, maybe, get more of that lot after you try it.