I'd not seen that comparison video before. Its interesting but I'd want to see that test done in manual vs manual because he's complaining about the dsg shift points, which probably could account for 1.6 seconds

I think you're a quite committed trackster, so probably your opinion on the value of the LSD is a good one worth listening to.
If you don't intend to track it though...
I know if it was me spec'ing the car though I'd be like....ooooh, ahhh, thousand quid... oooh..... oh go on, wtf. Which I think is how VW make another grand

And I'd probably never see the benefit at all, other than telling my mates about the fantastic LSD.