I have one - got it a year ago. I was told it was one of the first "prototypes".

I had a few instances where my audio would thunder uncontrollably when water got into the fairing. Static, crackle and pop. Scary loud..

This solution completely solved the issue for me.

 

That happened to me near the end of last season after washing the bike and I didn't use any high pressure or spay on it. It stopped the next day once it dried up. One of the reasons that made me put this on.

 

I suppose it might be something to consider on the 14 and up bikes if they are subject to moisture getting into the fairing around the vent.
As for the 2013 and down, I don't personally see the need.
Just make sure your inner fairing brass inserts are all good, so you can maintain a good seal around your windshield. I wash my bike in the car wash all the time, and I have no issues riding in the rain. I haven't had any leaks in 5 years of owning my 05 Ultra.