Testanon is a good product, I have used it myself, and it works.. Yes it hurts a little bit (not unbearable) but most prop based test blends hurt too. That being said, I like testanon, I will use it again, I just wish they didn't underfill their bottles.. I got 4.5 out of my last 5ml bottles.. Now if they overfilled their bottles by .5, I would never buy anything else but Ttokkyo.