Caberg - my opinion
I've a Caberg Justissimo, and I'm very pleased with it. It's not perfect, but it's the first helmet that I'd replace with the same model, when the time comes.
It's a flip up helmet, and it's made of polycarbonate rather than fibreglass or exotic composite. Will it take a 100mph spill? I don't know, but then I no longer own a bike capable of 100mph so it's not a real issue for me. I can't put it on without opening the hinged section, so (assuming the latches hold) it won't be wrenched from my head in an accident. That's unlike my previous Arai which could almost be pulled off my head by hand when fully fastened, after a year's wear and about twelve thousand miles. Even if the latches give way, it still has the protection of a standard open face helmet.
At some point safety factors merge with comfort and convenience. Riding into the setting sun I can flip the front to provide a sunshade and drop the tinted visor as well, for excellent visibility. With the Arai I would squint, slow down and hope for the best.
Bad points are noise and draughts. Nothing major. I'd prefer a double D ring fastening. The fit and finish is good, the lining is resilient and stays clean, and can be washed. Ventilation is good (too good sometimes). The latch snicks neatly into place after a year and a half of everyday use, and is operated by the side of the first joint of your index finger - very ergonomic design. Changing the visor is easy after the nerve wracking struggle with the sidepods on the Arai. It's brilliant for touring, for putting on while wearing glasses, for petrol stations and toll booths.
The Caberg has won many multi helmet tests in the UK, including RIDE magazine reports, against much more expensive oppostion. I believe that Caberg do make crappy cheap helmets as well, but so do many other makers.