In reply to neilwiltshire:
I've got one and think it's excellent. It deflects spindrift and other rubbish well and keeps it out of your eyes. If a big bit hits it, it folds down like a shield across your face.
If you're out-and-out dry tooling and are liable to bang an axe into your face without the chance to duck your face a bit, then you'd be better off with the gladiator-style wire mask that they also do.
Some people say slings get stuck on them, but I've never had a problem at all.
I've got a nice lightweight helmet too, but in winter I'll always cart the heavier one with its visor up the the hill in preference .