I purchased one shortly after they came out, previously I had been through a couple of Giro Hex's.
It's an alright helmet, fitted well enough although depends on your head shape. The straps and adjustment were fine, and mounting a light was easy due to the vent layout.
Ventilation was really good, the only helmet I've ever used that caused me to get head freeze on cold rides!
One thing that let it down was the quality of the pads, they had quite sharp edges where they were sealed which rubbed my forehead when I didn't wear a buff.
I don't have it any longer as I tested it's effectiveness by not ducking under a low hanging branch on a night ride. This resulted in me seeing stars before it was completely dark, some scars on my arms from the subsequent semi conscious stubble into the undergrowth, and a rather impressive crack in the helmet.
I was going to replce it with another, but went with a 661 Recon that On-One had on offer for the same price (£39.99) at the time. Whilst the 661 is a better finished helmet the pads are awful and if I was deciding again I'd go for the On-One...at £24.99 I'm seriously tempted anyway.
Hope that helps!
Any questions ask away.
Edit: This helmet also looks like a copy of an O'Neal Orbiter helmet, so the pads for those might be a replacement option, like these http://www.bike24.com/p261503.html