In reply to leewil86:
I use mine every now and again in pembrokeshire, but only put it on my harness if i know, or can see from the gound that there is a very good chance of using it.
Lots of the steep cracks at st govan's will take it
Routes I remember using on there include, Army dreamers, Chieftan, The loosener, Richochet, Flanker, hangover 77, and Derranged. There might be some others.
Not at all essential on any of those routes but very reassuring to chuck it deep in a chunky crack before setting off on a hard section of climbing.