I didnt think any other manufacturers made stuff as cheap[quality] and cheerful as Pro-Elec.
Well I guess it would be hard

But then at the price it makes a board full of RCBOs (instead of split-load RCDs) a reasonable proposition. In three boards worth (about 20 breakers), I've had one failure which isn't brilliant - but then the stuff is cheap enough for me to hold spares and it doesn't "cost" me to change one. They pass tests, so what more do you want.
Don't like the enclosures though - too flexible, and the flexible DIN rail means the front cover is partly responsible for holding the breakers in place.