No flame here to anyone, but I am not convinced that there are not benefits to spreading out the prop (fast acting test) to once a week in a stack (such as sust) that has other active tests. The feedback mechanism when injecting synthetic test manifests itself over time: as your body gets familiar with certain level of test the injections become less effective. Trying to maintain a consistent level may lead to a quicker downgrade of effectiveness - as your body easily figures out what is going on and adjusts. A benefit of sust may be just that which everyone says is bad - you get fluctuations of test levels in your system over time. Thus, it takes a longer time for your system to figure out how to compensate. In this respect, getting a prop spike once a week may be a good thing. It may also explain why I can gain on sust for 8 or more weeks at just 500 mg., whereas the gains I get on enanthate stop coming at about week 5 if I don't use more.