Since I am already half deaf and have really been battling wind roar, I decided to try the Windjammer. It is basically a neoprene sleeve for the bottom of your helmet.
- Price was about $27 shipped from the UK. You can save the ~$7 per unit shipping cost if you buy two.
- Doesn't eliminate wind roar at speed, but does noticeably reduce it. With earplugs in, wind roar no longer drowns out the ringing of my tinnitus (I'm just falling apart).
- I do still wear my earplugs. When I hop off the bike from my 45 minute highway commute, the ringing in my ears is much less than before.
- The helmet is not as easy to put on / take off. The neoprene is firm and tries to skive off my ears and nose.
- Less airflow into the helmet at speed, making it more prone to visor fogging. In the rain, opening the helmet's vents and leaving the visor open a click helps.
- When it is not being worn, the helmet is less open at the base, taking longer to dry. I let it sit on its side with the visor open to maximize evaporation.
- Attenuates wind noise a little more than general noise. Allows you to choose slightly less aggressive earplugs and have a little better chance of hearing other vehicles.
- This does make the helmet run much warmer (good in winter; not so good in summer).
Not a panacea, but definitely a net positive addition to the set of wind roar abatement tools.