My first cycle was sust 500mg/week and fina 75mg EOD for 10 weeks...I highly recommend it!!! I shot 1 amp of sust twice a week (exclusively in glutes) and on my sust days I would mix it with fina, really helped to mitigate the soreness. On the fina-only days I shot it in my bi's, delts, or quads. Fina and fina kits are cheap and widely available, I dont see a good reason not to throw it in, you will like the results, and it will help considerably if you are one of those that gets sore easily from sust.