I tried Insulin last year and made some experiences with it.Went up to 10 I.U.pre workout.
It is not that hard to handle if you use your brain and make some safty precautions like always having some dextrose and sugar at hand.To be honest,I'm accustomed to handle insulin from my job.
It made me fuller,gave me a great pump but in absence of hGH I had the feeling that it thickens my waist and makes me fat in general.
I stopped it and would give it another try only in combination with hGH.