Shark Evoline 2 ST no longer has a dealer network in the USA... 
Nolan 103 giving way to the new N104 come January... I think I can wait...
I think Pacific Powersports has picked up the distribution for Shark in the US. I recently found a "deal" on Ebay for the Evoline 2 ST, so ordered it. It is extremely well made and probably the most functional helmet I've ever seen. There is an excellent review on the helmet on
www.webbikeworld.com. The chin bar gives the most space between my mouth and the front of the bar than any other helmet I've tried on...probably a function of the chinbar being able to be pulled all the way back to make it a true 3/4 helmet when you want to. And the eye port is very large. Well balanced, even though it's a bit on the heavy side. They run just a bit on the large side....most size Large helmets are 58-59 CM, where the Shark Evoline is 59-60. I'm 59 so it fits...sort of. Nice cheek pads and if you wear glasses, it has a softer density foam where the temple part of your glasses go into the helmet...no pressure point there. I am still trying to determine if the helmet shape fits my head, so have been wearing it for an hour or two at a time around the house to see if any hot spots or pressure points develop...the jury is still out. I got such a deal that I can always sell it for what I paid and someone will get a new helmet for a great price.
The most difficult thing about purchasing a helmet is determining what shape your head is...Long Oval, Medium Oval, Slightly Round, Neutral (most helmets), Round, Egg Shaped, etc. If you've got a Long Oval head and try to put it in a Neutral Helmet, it's like trying to put a football inside a basketball...you'll have pressure points either on your forehead, the back of your head, or both. My head is somewhat oval shaped, I've discovered, so fitting a helmet is not easy for me. The only company out there who makes helmets specific to head shapes is Arai, and they don't make a modular full face, plus they are expensive, and you can't find many dealers that carry them so you can try them on. Another great helmet is Schuberth...their C2 is more for oval shaped heads, and the C3 is more for slightly round to round heads...but again, you can't find dealers that keep them in stock, and they are REALLY pricey. But, the lightest, most areodynamic helmet out there in a Flip Face/Modular helmet. Another nice helmet is the Scorpion EXO 900...it's a Flip Face, but the chin bar can be removed to make it into a 3/4 if desired...I'm not sure how often one would do that, but it can be done. It is more for a long oval head shape though. The Shark Evoline 2 ST is the ONLY helmet I know about that does what it does...removing a chin bar to make a helmet into a 3/4, like you have to do with the Nolan N43 or the Scorpion (there are some other ones out there too), does not seem very practical to me in actual use. If I decide to keep the Shark, I'll write up a review when I actually ride with the helmet, install an intercom, etc.
Half helmets of any kind are just out of the equation for me...I keep getting a vision of doing a face plant on asphalt at 40 mph...not a pretty picture. I've done face plants in the snow when skiing groomed trails, and it hurts like hell. I'd bet that 70% of HD riders wear 1/2 helmets though. But I'm seeing more and more wearing FF around here. Whatever blows one's skirt up...