for me it is really the inj-ester and 17aa variables, not the fact that something is legal or not-legal. when i was really into the real stuff i'd not stay on the same oral for more than 4-6 weeks.... i think alot of the gains from 17aa compounds is not directly through the AR, but through their manipulation of GH/IGF1/, CNS stim, etc. these benifits seem to be most pronounced in the first month of use. with stuff like eq though, it really is a slower/more subtle type of gain through increased tendon/ligament strength and RBC, plus direct binding of the AR. it will be weeks for your body to really take advantage of those benifits. also with deca you really get shut down anyway, even on a 6-8 week cycle, so there is no reason to try to keep it short. on cycle it was a given that my natty test would be zilch, so i would always use enough gear to more than compensate for that. with some pro-hormones though, i would not be as confident in the ability to completely replace my natty test, so would keep the cycle short to minimize shutdown. the final factor, at least for me, is the lack of scientific data/emperical knowledge on extended use of these new compounds. i know what 4 months of deca will do to me, but not really what 4 months of methyle-1 will do.