Yes I have tried them and could easily afford to buy them, would I? no I would not. Using compressed air to move a liquid is not a good idea in my opinion, in fact I cannot think of anywhere else an engineer would use that scenario. I find that I like to be able to input skill into my repairs and like the finite control the tools I use allow.
I also find them bulky and cumberson, which is something we do not need in our trade, keeping things simple and light is the best way to work in our trade.