I have always used Humolog (worked up to 7-8 ius) which I would take with maltodextrin, glutamine, creatine, beta alanine and L-Luecine. I have gotten shakey from time to time so a soda in the gym bag was a must. I am not sure how to quantify the gains as I also take AAS and some HGH, but I do continue to get steady gains (faster than my peers) at a young age of 40.
Hawk