I love my welded diff, should have done it years ago. Okay so it's abit cluncky on full lock at parking speeds but other than that you don't know it's there when driving normally. When I turn the wick up it just gets better, good drive out of bends without spinning all the power away and predictable over steer on the limit. Maybe a tad of understeer when I'm not giving it 100%, but thats easily delt with, just come off the power for a sec then give it the beans again, sorted.
Forgot to mention, Top Class Doughnuts too