It seems very practical in certain situations with proper precaution.
Where are all the people fear mongering about kalk paste/powder? I am pretty sure enough of that in the eye will make you go blind too. I imagine it is pretty nasty inhaled as well.
Anyone playing around with a 1w laser deserves everything that is coming to them.
Personally The biggest danger I see in the use of this, I am sure it has been mentioned here or on RC, is accidentally blinding a fish. Is one little misfire for a few milliseconds enough to permanently damage their sight with such a strong beam?