Looks a bit kooky but I've heard people say it works pretty well.....
 

 
https://www.kaoticaeyeball.com/

one person's experience!
 
I tried it at an AES show, which ought to be a pretty good place to test something like this, and was very disappointed. Not only did it do very little in terms of isolation, but it made the microphone sound bad, or at least not as good as it could.

I've used "shields" in teh past - one built from a music stand and Sonex, one commercial unit. For straight up voice-over work they both work very well (although the commercial one looks a lot nicer!!!!). For a solo vocalist they work well more often than not.
 
For almost every other application I'd rather a little bleed, they really do change the way a microphone reacts to the room - which is the intention, but for me in a way that is not always positive.

Here's a review (from 2014):
 
http://soundbytesmag.net/kaoticaeyeball/
 

The reviewer had a very different experience than I did!

A hollowed out foam ball with a pop filter. $200? For a product that cost "maybe" $25 to make?
 
Give me an f'ing break.

I've seen other mic shields, some more expensive than this, and I always wondered how they'd sound on guitar. Having said that I should imagine setting up an XY pair with them would be quite trying, lol....

sharke
I've seen other mic shields, some more expensive than this, and I always wondered how they'd sound on guitar. Having said that I should imagine setting up an XY pair with them would be quite trying, lol....

If your room is sub-optimal a decent shield can make a small difference, but you hit the nail on the head, you don't want to put more than one microphone in there - I did try to set up an X/Y pair, once!

wst3

sharke
I've seen other mic shields, some more expensive than this, and I always wondered how they'd sound on guitar. Having said that I should imagine setting up an XY pair with them would be quite trying, lol....

If your room is sub-optimal a decent shield can make a small difference, but you hit the nail on the head, you don't want to put more than one microphone in there - I did try to set up an X/Y pair, once!

Oh my I didn't even think of putting two mics in the same shield - I was thinking a separate shield for each mic, and considered even that to be unworkable. Some of these shields are heavy as well, so they're more suited for upright vocal mic stands rather than the kind of boom stand you'd use for a guitar. 

sharke
Oh my I didn't even think of putting two mics in the same shield - I was thinking a separate shield for each mic, and considered even that to be unworkable. Some of these shields are heavy as well, so they're more suited for upright vocal mic stands rather than the kind of boom stand you'd use for a guitar.

If I were admitting to past foolishness I might confess to trying that as well, but I'm not. If I had tried it I'd probably say that arranging two shields was the reason I tried to put two microphones on a stereo bar inside one shield.

Vocal Shields have a purpose, and they can be really effective for that purpose. Sadly that purpose is - at least from my experience - limited somewhat to single microphones on single sources. I've never been happy with any guitar recording I made with mine, for example. I do know a guy who has a low-ish ceiling (9 feet I think) and he puts a shield behind his drum overheads to make the room sound bigger. You'd think eliminating those reflections would have the opposite effect, but it works for him.

If you think about it a shield should be place behind you. The mic is facing you and picking up the room behind you not in front of you.