I like hitting the bis , there's no pain with the needle, goes in so nicely, and never hit veins, lots of control, only thing is can't put as much gear in them about 1 mL - 1.5 mL max and the biceps get sore as hell the next day but after you hit them enough you get used to it. Guess it depends on the type of gear you're using and mg/mL amounts on how bad the post injection soreness is.