I have experience with the Super-Q.
I like it. Very VERY quiet, no break-in which can be a pain if you don't have a good place to do it, and obviously a well made differential.
If you have the money, do it. As many other 240sx owners will tell you, better to do it the expensive way once, than to regret it doing it cheaper the first time and doing it twice.
I don't always live by the "most expensive is always better" crap, but in my opinion, it applies sometimes. This diff offers features that most do not. The no worry hassle of having to find a way to break it in without worrying about wondering officers makes it almost worth it to me as it is. If you mess up at all on the break-in of a regular diff, you are in a big uh-oh situation.
Anyway, just a $0.02 from somebody with knowledge and experience with the SQ.
Good luck with the purcahse, and no matter what, you will be happy no matter what diff you get!
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