In reply to UKC Gear: I have one and I must say there is a fundimental design flaw with the headlamp clips. Try putting a one on with gloves on and you'll see!!
In reply to Dave Searle: I've put a headlamp on my Shield II without too much faff as I remember it. Many modern low profile helmets have fiddly clips, I guess there are just somethings you need to take your gloves off for!