Heroin is alot better than MDMA imo, it puts 300mg pure mdma to shame. With heroin you can usually remember most of it too, you create memories around it.
Take the best orgasm youve ever had then multiply it by 100X and add some warmth in there. It usually hits in consistent warm mini waves so its like the peak of ejaculation over and over again, but better and for longer periods of time. Its very relaxing and unlike mdma, its very natural feeling, which is good.
Its like waking up as a child on christmas day to open presents, its like embracing the love of your life and holding hands with God. You WILL feel physically and mentally better than you ever have in your life. Your confidence will supercede that of anything youve ever felt before. Its much more raw pleasure than mdma not stimulating much. Remember you will want to do it again, almost certainly if your a responder. You cant forget the feeling it will give you. It will also make all other drugs look terrible in comparison.
Be careful because for some people its so good they are willing to trade a normal life for it.
Also everyone has a different response to heroin, but if your a good responder "WATCH OUT".
IMO oxycodone/heroin are very similar snorting, but heroin is superior IV.