I have two diffsonline units. One of them I bought used, and it slightly whines (it may have had the input flange swapped, which can cause pinion whine if it's done wrong). The one I bought new is in the race car and it's been great.
We just installed a (used) wavetrac unit in Mike's E90, but haven't driven it yet. It does spin both wheels in the same direction on the lift, but I can't speak to how it behaves in reality.
OS Giken has been incredibly unreliable in E46 applications. Failure after failure after failure is what I hear. I would not consider it.
The upshot of helical is that it gives you a basically completely clean steering response. Clutched diffs will be a lot more likely to impact steering in some way. Helical diffs also basically don't wear out, which has some virtues.
Personally, I really like the way that the 30/90 diffsonline units drive. On a street car, this is less of a factor though. I wouldn't have done the E36 diff if it hadn't been fairly cheap.
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2011 M3
2006 Sierra 2500HD 4WD LBZ/Allison
2004 X5 3.0i 6MT
1995 M3 S50B32
1990 325is
1989 M3 S54B32
Hers:
1989 325iX
1996 911 Turbo
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