Yeah... positive at first. Until your brain gets used to it, and it becomes the new boring normal. Not to mention without it, you experience physical fucking agony like I am right now, wishing you had a gun to put a bullet in your head. Not to mention tolerance. How to attain the same high, you need more and more of a dose over time, and other side effects kick in like over-sedation ruining the high. At this point, welcome to hell. Hope you enjoyed your initial stay.
This is how it is in 99% of cases when people set out to use opiates with any sort of intention. It even happens to regular people just trying it too, or getting a random prescription. It has taking longer than half a decade for me to progress to shooting heroin. I started out taking 2.5mg oxy (half a percocet) for pain and getting really high off that. My brain simply isn't capable of attaining that sort of high anymore.
How long have you been using and at one dose? It can take years to destroy you. It took 18 months of constant intake of opium, hydromorphone, heroin, oxy's for me to develop any sort of serious withdrawal symptoms at all. Before that, it was like having the flu (6 months in). Now, it's two weeks bedridden out for the count, unbelievable suffering followed by months/years of agonizing cravings, panic attacks, insomnia... I don't even bother, I choose to sniff dope and eventually will soon shoot it.
It's just never worth it in my opinion considering the potential outcome. If you have something like chronic pain and not an addictive personality it can work out sometimes. Or if you're just trying it for fun and you don't already have a reason aka something really bothering you.
If they were legal and you could have them all the time, it wouldn't be so much of a problem. Not the healthiest thing but not the worst thing either. A lot of the issues come down to stigma and legal problems along with the black market and availability. People who want or need them, who are full blown addicts should just be able to have them in my opinion. I am personally a fully function human being when I have a nice dose of heroin in my system. Otherwise, I can barely get out of bed unless I take meth.