The day I got these, I tried to put them into the supplied holders and I noticed they almost scratched the mics as they went in. Then the holders were much too stiff, I tried to loosen them carefully with a screwdriver but this just damaged the aluminium - my heart sinks every time I open the box and see them:(
I promptly ordered some generic plastic holders from Thomman for a few euros and have used these happily ever since. I'd STRONGLY recommend this if buying the set.
Also, after a year or so one mic developed a fault (noisy). As expected, Thomman promptly facilitated its return to Oktava for servicing. Now, the screw and aluminium on that mic is slightly blemished and you can tell the mic has been taken apart - even though this was by the manufacturers. I'm now a little worried this may happen again when they are out of warranty, but I can only presume they won't.
I'm not sure if the black versions would hide these cosmetic problems a bit.
HOWEVER all this said, these mics sounds GREAT for the money, I love them and have bought most of the accessories available. They have a definite high end roll off and a warm retro character that I love, although if you were making more contemporary music this may not be too your taste.
The omni capsules sound great too, I'd also recommend buying the figure of eight attachment for a very cheap way of attaining figure of eight and mid-side recordings.
A very affordable way to get a microphone artillery, I love these mics and would definitely buy them again.
I weigh the quality downfalls against the sound quality and would rather work around these and get a great sound!