I have tons of monster RCA cables because I can get them all the time at thrift stores or garage sales over the years for maybe a $1 a cable regardless of length. Besides issues with the company ethically that anyone may have, and that their non-THX labeled RCA cable connectors bind on way too tight and can actually rip out your RCA female connection on your gear if you are not careful removing them, is there any reason to avoid them for sound quality or interference resistance?
Again, price is no issue as they are not new and are dirt cheap and readily available.
(Personally sometimes I have thought I heard a difference with a cable, but then I go back and not so sure. Not so sure to me says it was in my head and I move on. So in the end I have been using my audioquest and monster cables since I have/get them for cheap. i don't expect them to add anything, nor that they would be any worse.)