In reply to sbattams:
> Any idea why this might be?
> They look great fun as long as you dont drop them on your buddy below.
I think it's largely down to the fact that it's a relatively new idea. We always intended that the tools be used with umbilical leashes and are tethered to your harness. That way you can't drop them more that a couple of feet.
We have many walls using them here and in the US. I'm sure they'll become more common and widely accepted.
They are great fun and open up the whole wall to new possibilities. Even very easy routes can become new challenging projects.