They are good fun. The air assist helps reduce the charring on the cut edge in woods, as well as stopping flames.

I engraved some glass bottles for Xmas presents (www.benjaminalderson.com) on a friends laser - definitely needs an improved extraction system as even with a mask it got bit raspy on the throat :S

My laser I'd almost up and running - got power on/off to laser tube working, just need to sort out the power level selection now.