KBC's and HJC's are typically what the squids around here wear as they're usually the cheapest and popular among that crowd. They have been making a move toward Icon I've noticed.
I'm sure most helmets will protect your noggin in certain crashes. Some people in the States prefer the D.O.T. (Department of Transportation) helmets versus the Snell based helmets as the D.O.T. shell is softer which will absorb more of the impact. Snell lids on the other hand expect multiple impacts as are seen in race car accidents when you get thrown about in a cage, this makes the shell a little harder. We unfortunately don't get any E.C.E. helmets here.
Truth is, you're basically paying for fit, finish, weight, components, removable liners, bling, internal noise, a name, r&d, etc etc etc.
I'd say the most important thing over anything else is to get a properly fitting helmet, one that is snug and properly sits on your head. Fortunately, the more expensive helmet manufacturers use a number of different molds for their lid models for different types of heads, the less expensive brands use a lower number of molds for your head.
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Now my take on it, if the helmet looks good and you like it, go for it. You'll probably notice that the lid is a little noisier and a bit heaver, just make sure that their mold matches with your head type. I've been an Arai fan for years, they've protected my head 3 times.
As for what I use, it's a tossup between what I do. For a majority of my canyon carving I typically wear my Arai RX-7 Corsair with the Tommygun pattern. When I commute and for some of the stuff in the mountains, I usually wear my Scorpion EXO-1000; having that extra visor is nice and the helmet seems a little quieter than the Corsair. My next helmet will probably be a
, they seem to look good, feel good, and they support our local motorcycling events.
With all that being said, guys on the track here use everything which includes: KBC, HJC, Arai, Scorpion, Suomy, Shoei, Icon, Shark, and as well others. They should all protect you in a crash, as long as they don't fall apart on you.
I hope I have either enlightened you or have made you even more confused.
Cheers