my welding supplier droped one off for me to try out about 2 months ago, and so far it has preformed as good if not better than my water cooled gun. if i had known about them 4 years ago i could of saved a chunk of change...(1-tweco water cooled gun that leaks---$300+)
(1-water cooler---$400+)

(1-pac-mig---$300+)

also just got a pac-tig to try out and it seems just as good.

hope this helps