Primo is crap, it makes everything way too stiff. Good for polishing up at the end of a cycle or for increasing the size or appearance of defining lines and a very little strength and vascularity. I like my drugs to give me the whole enchilada. Agression, appetite, strength, cardio, recovery, overall feeling of well being. Primo might increase appetite a little at the beginning and then it goes down fast. Very effective on a low cal diet. What kind of pussy eats a low cal diet for more than a few weeks. Probably fatties, they aren't training hard enough for aas anyway.
If you want to get huge you have to go test. It is the basis of everything, and it has enough variety that you could have very different cycles switching from prop to cyp or sus or test e too susp or both. Other drugs don't have as many modes of administration.