I've tried a few and never had success. Toner and batteries/chargers (laptops, cameras, etc.) are two things for which I will 100% avoid the knockoff brands.
One thing I will recommend though is if you have a printer that has drums that "age out" due to page count and need to be replaced, you can usually trick them into thinking they are new again with a cheap "chip" (<$10) and they'll be good for another full cycle or two.