Got the carbon the other day, used it today for the first time.
I love the visibility this thing gives. You can hardly even see it on you let alone feel it - it is incredibly light. Also the water runs out of it instantly which is really nice.
I was iffy on whether it would be comfortable or not out on the lake since the straps didn't feel so great against my ears but I had zero issues while I was out there today. The helmet fit securely and comfortably.
Would I say this is sufficient? For almost all jet skiers I'd say yes. The only issue I could see would be the larger opening on the front. It does not turn me away from the helmet at all though. And if you're worried about it, buy the bar and/or wear goggles.
Overall I think it's a great helmet and I'd highly recommend it to anyone riding.
Subhard, I really like the light weight of my carbon but I have never seen the regular models so I cannot compare. I don't think it's a huge deal, but I really like mine.