The DC K10 was a popular helmet back in the day. I wore one for years with the Oregon Aero upgrade. When the interior wore out, I continued with the standard interior. Keep in mind it's somewhere between a slap hat and a real helmet; so the decision is balancing your risk of catastrophic component failure (or just flying it into the ground) v the comfort and easy transportability of the K10 with a DC headset (assembled it fits into any suitcase)
http://www.oregonaero.com/aviation-helmet-upgrades/additional-helmet-upgrades
BTW: I use a Gallet 350 at the moment, but on long days sometimes change to the K10 for comfort-
even though a co-pilot asked me last year if 'I'd made it myself' 