Rubenstein is excellent. He has his teaching "shtick" that doesn't vary much, year-to-year, and is very effective. The only drawback, if you could call it that, is that his curve is probably very tough because unlike in most civ pro sections, all your classmates actually understand what's going on. Outside of class, he works with a lot of students as RA's, but has a reputation of being clear that he's not interested being especially "close" / not wanting to "be your friend."
For some insight into his past / HLS, this is a real tearjerker -- unfortunately none of this comes up in class: http://www.law.harvard.edu/students/org ... benste.pdf
Rubenstein will teach you civ pro - I wouldn't expect anything from him beyond that, but you will know civ pro.
He cold calls based on who has a connection to the case - it's usually geographic. (For instance, I went to undergrad in New York, so I got cold called on a case from New York.) Sometimes he gets a little creative (he called on a div school joint degree candidate for a case involving an "act of god" in my section), but it's usually very predictable and you're usually only cold called only once per semester. If you have a connection to North Carolina, there's a good chance you'll get cold called for the first case.
His exam is closed hard-drive, but you can bring a physical outline. It's extremely straight forward and tends to cover the same issues from year to year, so I highly recommend practice tests (moreso than usual - the focus of your studying should be taking as many of his practice tests as possible). This also means there are fantastic outlines already out there, so I wouldn't waste time making your own, but rather finding one that works for you, updating it as necessary, and spending your study time learning how to use it very quickly.
(And highly seconding that article, my friends and I learned about it when we were out at a bar and were just all sitting there quietly reading it on our phones)