Objection wrote:It seems to me that it makes more sense to use the supplement assigned for the course, in particular if it is written by the author(s) of the casebook.
Next thing you know, you'll be letting us know the sky is blue and Vanessa Hudgens is your girlfriend...
You definitely want to use supplements assigned for the course and/or those written by the professor, but if they're assigned (even if only recommended), I wouldn't count them as supplements.
My CivPro prof recommends the E&E and my property prof recommends Glannons.
But there are other things that can be helpful, such as case summaries (particularly when they're keyed to your textbook).
I agree I could have left myself with a lot of unhelpful supplements if my profs had recommended other items.
But in my case, my Civ Pro prof recommended E&E, so that worked out. (He also requires the supplement keyed to the casebook) And none of my other profs specifically recommended any supplements so I figure I can't go wrong these.
(They are also the consensus picks on TLS, btw. I had some time to kill at work last month so I spent a lot of time going over old threads as a way to feel productive.)
That said, if there's a supplement recommended by the prof, written by the prof or keyed to the casebook, that's definitely a better choice.