Actually the prop in the SUST is not useless. There are 2 kinds of prop in SUST. Test Prop and Phenyl Prop. Both are fast acting. Phenyl Prop is basically the exact same compound but has a 1 day longer half life than test prop. This is why most pros use Sust to jump start their cycles. Starting your cycle with an injection of 500mg of Sust is a great way to get going. The Isocaprioate ester in SUST is a mid term ester that will also get in your system rather quickly. The long acting ester is Test Decanoate.