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Actually, I'm considering getting a Cayman S in about a year, and considering the locking differential option. From what research I've done, it seems the advantage of a clutch-type differential is that it works under braking and very low one-wheel traction situations, whereas the more esoteric types don't. Disadvantages seem to be: possible understeering effects during hard acceleration in corners, possible "fighting the PSM," and a lack of physical robustness of the unit. I doubt I'd be driving so hard as to abuse it, so it. Also, I wonder if it's really "necessary" for a non-track driven car. Even with normal wear-and-tear, it might not be worth having in my case. As it's a relatively new option, there isn't that much out there in the way of conveyed direct experiences with it.

Actually, I'm considering getting a Cayman S in about a year, and considering the locking differential option. From what research I've done, it seems the advantage of a clutch-type differential is that it works under braking and very low one-wheel traction situations, whereas the more esoteric types don't. Disadvantages seem to be: possible understeering effects during hard acceleration in corners, possible "fighting the PSM," and a lack of physical robustness of the unit. I doubt I'd be driving so hard as to abuse it, so I wonder if it's really "necessary" for a non-track driven car. Even with normal wear-and-tear, it might not be worth having in my case. As it's a relatively new option, there isn't that much out there in the way of conveyed direct experiences with it.