On a long cycle make sure you get a cholesterol check that includes your HDL(good) and LDL(bad) levels. You here about these extremely long cycles that wrestlers/pro football players etc do and every now and then its a heart attack at 30years old. There are drugs that can be added to lessen the effects of cholesterol sludge in your arteries when on a long cycle ,if it becomes a problem.
Also its one thing to shut down your natural test,but an added complication to this especially on longer cycles is additional atrophy of the testicles,the smaller they get the harder it is to make your natural test rebound post cycle. If you can't get the natural test up and running then you will not have enuf test to support the additional muscle mass you've worked so hard for and you'll lose alot more of your gains. I like midcycle HCG to minimize the atrophy.