The CZ 511 (.22LR) and the CZ 611 (.22WMR) were both sold here in New Zealand from about 10 years ago. I briefly handled a 511 and fell in love it immediately. It felt as comfortable as my Lux. They don't come up for sale 2nd hand very often here and when they do they command quite good prices.
My brief experience with the 511 was that it was very easy to use, well built (though there were some cosmetic shortcuts and shortcomings), accurate and functional. A 511 and/or 611 is on my "to get" list and when I find them they'll replace my 10/22 deluxe.
If you like the CZ 452, you'll like the 511. My only real concern was the stock trigger, however, a reasonable 'smith can fix that for you.
Spinner