Acquired a CZ 455 American about 1-1/2 years ago. Outstanding quality! The newer 457 is very similar, I think the only change of real functional substance is the safety lever on the bolt shroud, making it a bit easier to operate.
Mine came with 1" steel CZ scope rings, which I recommend. Again, excellent quality. I added a Williams receiver sight and front ramp with bead, which I prefer for small game hunting. Have a Tasco World Class 3-9X40 in the rings now and ready for a trip to the range to see what the 455 will do at extended range.
I like the CZ every bit as much as my old Anschutz 164 sporter, which one of my grandchildren enticed away from my gun safe. Design, production quality, and finish are equal to the Anschutz. The CZ also offers the option of easily interchangeable barrels (.22LR, .22WMR, .17HMR) for those wishing for more possible uses.