In reply to Cameron94:
We met some French climbers on Ben Nevis this past winter who had some of these, and they seemed to really rate them. They were lighter than the usual BD/Grivel/Petzl/DMM offerings, and (apparently) the replaceable tips are a boon - sort of stuck on with glue, I gathered, so they don't unscrew themselves apart, but not permanently.
I keep meaning to buy some - with a more favourable exchange rate than a while ago, now might be the time...