Just to add my 2p worth to what everybody else has said. Yes, I use one and, after 40 years of riding (for most of which I've worn full face helmets) it is without doubt THE best way to remain fog free....and the tinting works a treat too!
As somebody else has said, you don't need to pay full RRP but they are still worth it even if you do pay top wack....yes, honestly they are that good
