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A 1.5-way locks under decel as well, just not a 100% lock. It's about a 50% lock, that's why it's called 1.5-way.
And if you know how to drive a car equipped with a 2-way LSD and have the suspension set up for the 2-way LSD, corner entry understeer can be overcome.
But for most people, the 1.5-way LSD is better for grip type driving, and a 2-way is better for anything that requires the LSD to be locked 100% during both acceleration and deceleration.
As for 1.5-way LSDs costing $600 less than a 2-way LSD, I honestly don't know of any that have such a dramatic difference in price.
Maybe if you were talking about a 1.5-way Metal LSD versus a 2-way Carbon LSD from Carbonetic/ATS or something, but even then, the difference is much less than $600.
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