GHEEK goggle protectors: functional and stylish?

Here’s a neat product that just crossed my desk: GHEEK goggle protectors. They’re a slick neoprene shell that protects both the inside (so you can stick them on your helment) and outside of your lenses (so you can throw them in your bag and not worry). In theory, they seem like a smart accessory and look OK (there are tons of styles to pick from). I’m curious if anyone else has used a product like this?