The Kluson brand itself gives a quality quarantee. Three brass saddles and completely bent steel bridge, feels very solid. Not compensated saddles, but if you know how to use a small file, you can do it yourself.
I tried some cheaper ones, thinking that there's really no difference. And there shouldn't be, as long as the materials are right. But the problem is, that you don't really know by looking at the pictures about the materials. I once got a bridge that was supposed to have brass saddles on steel bridge, but as it turned out, the bridge was really bronze that was coated with thin nickel and saddles were aluminium coated with thin bronze! And the sound was not right.
But there is no worries with Kluson, they are right and correct vintage. In dimension and sound.