I've not had a gripper so I can't comment, but I understand they are more heavy duty and even more capable of transferring the traction. (not had a torsen so can't compare either)
But on my L-series it completly negates any understeer on throttle - I can be accelerating on a rounabout before the exit before, and still remain within the lines on the roundabout and round the exit curves - sometimes even WOT
It is honestly night & day the difference it makes to traction - it is *the best* mod I put on the car.
Helps a little on slippery country lanes too as shifts traction to the wheel with grip - useful this time of year and in winter 
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Mods Fitted
Pipercross Filter; Full 2.5" 'Wingy' exhaust; Donny Custom Turbo outlet pipe; Custom injectors;
Uprated gearbox bearings; Helix Clutch; Quaife ATB; Upgraded clutch Hydraulics; FMIC; Ported Head; ARP headstuds; Leda coilovers; 'Brembodge' 326mm disks/DS2500 pads
Dieselpowered
Fitting Custom Hybrid Turbo (1856GTBv) & controller; Remap, swirlpot, lift pump
AMW Motorsports
Custom exhaust manifold & downpipe
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