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I use the OBX HLSD.
I don't see much difference between the OBX or hitachi R200 type accept that the OBX was built on a cheaper more horrendous chinese production assembly.
Helicals make the rear end much more manuverable for auto x. For drifting you would have to keep your rev much higher because of the way the torque bias is designed from stock, (you can always change the pre load washers)... As far as reliability you can rebuild a helical, you would have to throw away a viscous type. Parts for the helical are also cheap and you can also manipulate and change the torque bias ratio with the way you set pre load washers (by thickness, and offset).
Personal opinion...... I like my HLSD mostly because I drive on the street often, and track it about only 5 or 6 times out of the year. Braking responce for the rear is much better than most clutch locking types that are 1.5 or 2 way, and even most viscous types. Also the helical diff is a quiet diff it doesn't make any noise at all if you've done the proper steps to set gear lash...
Depending on how you set pre load washers from stock you can make a helical lock up much faster with less torque than a 1.5 way clutch type or viscous type diff. Only concerns you should worry about on the helical is wheel lift, or wheel hop which can temporarily throw off the torque bias, and have a wheel spining around like a open diff. That would have more to do with how your suspension is set up and designed.
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