I got the Gath Surf Convertible
http://www.gathsports.com/productsingle.php?id=5 yesterday and gave it a try today.
I've been a fan of Gaths for years after my board landed fin-first less than 1m from my head after a botched jump. My last Gath served me well for over 7 years before it wore out. It was the fixed visor surf hat.
I wish I had have bought the convertible long ago - it's lighter, has better air flow, more padding and is more comfortable than my last one. I actually forgot I was wearing it today, which I could never quite do with the old one.
The other good things about the convertible are that you can choose whether you want to remove the ear covers or not, and what type of visor you want (if any).
I got the new "peak" visor which screws into the sides of the helmet and can be raised or lowered to your perfect position on the fly. It's similar to the latest bicycle helmet peaks and can be seen on the Jedi helmet in this pic
You can get these sunglass-like attachments if you prefer

.
Or just leave it as it is.
Thumbs up from me.