The big difference in remanufactured calipers (or pretty much anything remanufactured for that matter) is the parts and the process they use. The cores they start with are pretty much - but not all - all OEM. You can take a good core, "remanufacture" it with a poorly controlled process using cheap parts and end up with a great looking caliper that's not going to last as long as OEM. Or you might end up with something pretty good. How do you know what you're getting? I'd suggest the warranty is a pretty good indicator.

My son recently bought some fancy remanufactured red painted calipers for his Scion tC. I didn't trust the quality of the parts they used, so we bought an OEM caliper rebuild kit and replaced the parts inside with OEM stuff. Oddly enough, the stuff we pulled out looked pretty pathetic compared with the new OEM stuff we put back in. Yup. You get what you pay for!