I had two of these at one time, but that was a long time ago and they got pitched out. That may have been before I got an insulin injector. That device forced a spray of insulin through the skin using hydraulic pressure. The claim was that because it was finely dispersed, it would start working more quickly. In reality, I think the effect was minimal.
So, after several of these experiments, I went back to the simple disposable syringes without any extra gadgets. They seem to work just fine.