I missed the full face thing. I haven't felt protected (not safe, but protected) without a full face on a bike since 1975 after having my first Bell Star. It was a legal requirement back then here in Ohio, but I had flat tracked and harescrambled in the past and knew the benefits. I'd also trials ridden without, but now I'd at least use a bicycle helmet if not some sort of shortie. It's now legal to go without here, but not something for me to do without some emergency situation.
I also have a CL15. It fits my head shape like a glove. It felt tight, but even after over two hours, no hot spots. I did want to get it off at that point, but that's kind of true regardless. Two hours without taking a helmet off is a bit fatiguing. Of course it's far better than two hours of wind blast in my face.
I got a chin curtain - good buy. It takes out some of the chill from the wind under my chin. The flange that slides into the joint between paddint and helmet shell needs trimmed about 1/3 shorter and is still a bit of a chore to fit, but it's well worth it.
I picked up a breath deflector too, but it is a mediocre fit in the S size helmet, scrunching up a bit. It's fine for no glasses, but I'm not so sure about with them, seems to be sure interference. Some modifications may be in order - I've read a lot of plus comments when it comes to fogging. It's a shame they don't have some possible modifications that could be done to tailor the fit to one's proboscis. Keep the forming tab off so the part around the nose could be fitted a bit then the tab riveted back on with some sort of plastic snap rivet. I'm gonna play with the thing a bit.
Regardless, for this rider I want to protect what has the worst capability for healing if banged or scuffed - my cranium!
PS.
Let me give a shout out to the thought of wearing a full face off road helmet on the street. I've done it a lot on both the dual sport and the KLX. Two good reasons - air flow on a hot day and a real visor for low setting or early rising sun. I wish full face street helmets had similar capabilities. I eventually plan to go to a specific dual sport type helmet sometime due to having both visor and face shield at the same time. Some friends have them and they love them.
A solid color MX or dual sport helmet can look okay on street use if image is part of the equation. Even shortening the visor a bit is also possible.
As for the visor catching wind, unless you ride with your head tilted back or blasting about well over 60 mph it's not much of an issue. It becomes second nature to have a slight downward tip of the head, even with regular road helmets when riding on bright days.
Here's my MX helmet:
Even visor's not too long. It's an old HJC. A pair of wrap around glasses that fit in the openning, or goggles which I do, takes care of the eyes. But those sneaky bugs sting when they get through to your cheeks!
Scorpion EXO-750 Vintage black an gold. When I ordered it from Cycle Gear in Jacksonville, FL the salesman and I were saddened to see that it came with a clear lens and not a mirrored lens like on their website. He threw in the mirrored lens for free, yay! 
The only time I don't wear a helmet is when I am going somewhere just around the corner 8n my neighborhood...like to Subway or the local convenience store...