Don't forget the part where many consumer drives won't let you play with the SCT ERC settings, and some of them just completely crap out on URE and won't come back.

(My personal favorite was when I discovered a certain model of "consumer" drives we had thousands of in production claimed to not support SCT ERC configuration, but if you patched smartctl to ignore the response to "do you support this", the drives would happily configure and honor it.)