It's the best because it is thinner than anything else so it goes in easy with a 25ga pin and draws just fine with a 23ga and it is completely painless even when doing high concentration injectables or with prop (anyone who's tried AnT 500mg/ml test or his prop knows what I'm talking about). Also, because it acts as a solvent as well, I believe no BB is needed at at all, just BA for sterilization but don't quote me on that.