Excerpt: I bought two A2WS-BK Black Foam Locking Windscreens for my SM57s in order to add an impressive 'Presidential' look to the podium when I run sound for a speaker. They also come in handy when I get a request from some vocalists who prefer singing on a Shure 57 over the standard Shure 58. Finally, in a windy outdoor environment having the foam windscreen cuts down on low frequency rumble from wind gusts.
Pros: Clear Sound, Durable, Easy To Use, Lightweight, Versatile
Excerpt: We use these windscreens on all our 57s. They make the microphone less sensitive to plosive "P" sounds and dress the mic up like it belongs at a president's lectern. The locking ring and set screw keep the windscreen securely on the mic capsule. The only downside is that these are more expensive than foam-only windscreens. Also, you can't replace the foam independent of the locking ring when the foam has worn out.