In reply to tehmarks:
I have the Grivel Stealth. It's light and comfy, but it's a bit tight with a hat under it (my head is big and round; a more elongated head would probably fare better) so I only use it in summer
It hasn't had a lot of use, since I'm only just starting climbing (so it's probably got about 2 weeks of use in total), but I've already managed to put a couple of noticeable dents and 'bruises' in the plastic shell from hitting some overhanging bits a couple of times. I probably wouldn't buy one if I was looking for ultimate durability (I've taken similar hits while wearing my BD Half Dome and it marked up far less)
That being said, I think it looks cool so when it's time to replace it I'll be getting another