There perhaps isn't a lot to say about such a simple item, but having tried a few makes I can definitely say these have been the longest lasting, standing up well to cleaning as well as the occasional microphone droppage (they probably saved me a fair bit in capsule head replacements that way too).
The colour coding is handy for keeping track of different microphones (and cleaning requirements).
Sonically, they also have minimal impact on the signal. There is a typical and inescapable mild reduction in the high end, easily compensated for via EQ and they simultaneously help remove a bit of wind pop so the benefits, for me, greatly outweight the high-end issue.
Very useful to have nearby in a live setting.