Never tried the Czech or Romanian trainers, but have the CZ 452 Scout. It is sswwweeeeet.. Fit and finish are great, all steel and walnut, except the magazine, and all-metal magazines are available, too. Little gun is extremely accurate and is sized quite nicely for youngsters. A dummy magazine is supplied to make the rifle function as a single-shot, and, as proficiency and safe handling skills develop, the 5 or 10-round magazines can be used to make it a repeater.
I was quite pleased with the one I shot and taught my son to shoot with, and at $175 out the door last year, the price wasn't bad either, considering the quality.
FWIW, I highly recommend the Scout as a youth trainer...