I have seen La Nouba three times and am sure to see it again one of these days, but probably not on our upcoming trip.
I have also seen Drallion, O, Varekai, Zumanity, Quidam(2) and Mystere(3) and enjoyed them all but probably would not go see Zumanity again unless the person I was with really wanted to see it.
They are all great shows but not for everyone. Most people tend to like them but there are some people who just don't enjoy that kind of thing.
If you do decide to go try and get tickets at center stage, second level in the first couple of rows, near the sound engineer, as it will give you the best view of both the stage and everything else that happens. Also, make sure to get there at least 15 minutes early and if you don't, don't say you hadn't been forwarned.