Oxycontin has been a life saver for me. To go brand name costs me extra ($35) additional ON TOP OF my normal co-pay for scripts. *sigh* But, I'll tell ya, that $35 is worth it to me cause it means that I'm at work more which means more $ in my pocket (till I pay the bills) and my boss is happier with me.
Please heed Jim M's advice though, and don't talk about having a prescription for it. There are people that not only will try to either manipulate you to get it, or there are some people (it has happened in my community) that will literally break into the house just for what's in your medicine cabinet. I say this for your safety.
Then there is the other side of the coin that he mentioned where people that are not CPers, or that are uneducated, will automatically assume that you take these for fun and not for necessity.
But, I am very glad that you have found something that works for you. I know how relieved I was when I found it to work for me.