Ehh most generics are pretty much the same thing as the product they are trying to imitate.
With drugs, the active ingredient is 100% the same, and fillers vary, but usually the difference in fillers is not significant in the effectiveness of the medicine.
The generic pop tarts that Aldi's has kick ass, I like them better than real pop tarts.
Generic pop tends to suck. I love my RC, Coke, and Pepsi, but "Sams Cola" is teh suck.
I tend to buy my clothes at Kohls or sometimes Walmart. I don't care what the brand name is, I just make sure whatever I'm buying fits well. For Jeans, Lee, Levi, or "Wrangler" all fit fine and last a long time.
As far as computer parts go, Newegg and some other larger vendors do have their own house brand, and most of the time it's just rebadged stuff. I've never had an issue with Newegg's house brand and I will buy again if it's priced right.