I have purchased a set from W&N 3 years back, and they were horrible parts. Originals are plastic and smooth chromed, the W&N parts however were chromed alright, but the surface on which the chrome was laid was not smooth at all. It shows the milling paths from the milling machine that produced the plastic injection mould right through the chrome layer. W&N replaced them when asked, at no cost, but replacement parts had same "ripple effect" logic, as they are from the same mould...
Happy to hear if new orders at W&N yield better parts.
(the pics on the website of Prinz show parts with a perfect surface. )