The four different testosterone esters in this product certainly look appealing to the consumer, there is no denying that. But for the athlete I think it is all just a matter of marketing (Hell, why buy one ester when you can get four?). In clinical situations I can see some strong uses for it. If you were undergoing testosterone replacement therapy for example, you would probably find Sustanon a much more comfortable option than testosterone enanthate. You would need to visit the doctor less frequently for an injection, and blood levels should be more steadily maintained between treatments. But for the bodybuilder who is injecting 4 ampules of Sustanon per week, there is no advantage over other testosterone products. In fact, the high price tag for Sustanon usually makes it a very poor buy in the face of cheaper testosterone enanthate/cypionate. Bodybuilders should probably stop looking at the four ester issue, and stick with totals (Sustanon is just a 250mg testosterone ampule). Were enanthate to be available for say $10 per amp of 250mg, and Sustanon priced nearly double that, buying the Sustanon would be like throwing money away. If you could get nearly double the milligram amount for the same price with enanthate, this is the better product to go with hands down. Leave the high priced stuff for the guys who don't know any better.
This is just interesting and I figured to mention it because many have no doubt heard of this. If you have not, now you have the full explanation without hearing the first part without the explanation and having to wonder why. These two drugs do not convert back and forth in the body, the above example is simply illustrative of why you may have heard or read before that these two drugs are similar. Only in structure. In action they are very different (as many of you who have used each of these drugs, no doubt knows). But now you know structure-wise. And if you have heard this before, now you know exactly why they are structurally similar.