Yea, at first it works great, but it usually doesn't end that way. At first it may seem to give you lots of energy, make you more motivated and functional (though it doesn't have that effect on everyone), but then it may make you just want to sit around and be high, be too high to be able to do anything or go anywhere, or be in withdrawals and too sick to do anything, etc.
This will end up being your life, and the euphoria will decrease over time to staying just on the side of good, or not even that and just maintaining health (many heavy users are actually deeply depressed). So for most it ends up making them completely unfinctional, and just in a little better state than before or just needing it to be normal. Not to mention the destruction of the financial and social life, and problem with the law, that will inevitably come with time.
This is why it's not a good choice as an antidepressant and I hope you understand how serious this is. Rare is the person with the self control to be able to use opiates in a responsible manner and stay completely functional on them, and I think this is more for those who have it well together already and doesn't want to use it to patch up a ruined life. Though it can seemingly be used that way, but leads to a whole new set off problem, and eventually stops working. Mainly it kills motivation and eventually makes people want to do nothing but get high and unable to do anything else, and the daily problems an addict will face can be unsurmountable, as anyone will tell you. But if you want to go along for the ride, that is your choice, no way of knowing what it had in store for you.