The whooshing/roaring sound of wind noise has bothered me for several years particularly when riding with friends because it was much tougher to carry on a conversation without lots of 'What?' or 'Sorry, could you repeat that'.

So I bought a pair of Cat Ears and overall, I have been very happy with them. I would say they cut the wind noise 50%-70%. They work best when my helmet strap is snug against the side of my head. They don't work nearly as well with a looser strap.

Two minor complaints.
1) They are goofy looking
2) They smelled like cigarette smoke when I got them but washed them with soap and water and that fixed that

Overall grade A-