I read through Randy's article and in 1 paragraph he helped me make up my mind on ORP...
"So is ORP measurement and control recommended for nonscientists who also happen to be reef aquarists? My suggestion is no. There are interesting things to learn by measuring ORP, and I recommend that everyone with any interest read the following sections to better understand it and decide for themselves if it is worth doing or not. Nevertheless, I have not measured ORP in my aquarium for years, despite having the tools at hand. It is simply not very high on the list of things that one can usefully do to maintain a high quality reef aquarium, in my opinion."
No ORP probe for me