If you're learning to grip drive, you probably want to stay away from the 1.5/2-way LSD's. They will not help your learning curve since traction is easily lost on throttle-off/heavy braking situations.
Just remember a few things: All LSD's will wear during ANY type of cornering situation, they just wear faster when wheelspin occurs. Also, LSD's will not add traction, but rather help you read your car's traction limits and aid in controlling loss of traction.
Also, rebuilding a stock LSD is an option, so VLSD's are a viable option. They are a good beginner's tool to learning grip, and easily rebuilt/swapped. It's really simple, and anyone who can swap coilovers and read directions can easily overhaul their diff guts.
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