Ive only driven a 172 with a quaiffe, and honestly couldnt tell it apart from std...twas shit.

Driven a couple of clios with plate LSD's, on the other hand, they do literally pull you into a corner. Very impressive.

For the money, Gripper would be what I go for on a road car. They are bottom of the scale price wise, but seam to do the job nicely...less adjustment with them, but unless you wanna pay £2k for a sadev diff thats kinda irrelavent.