Coming out of low speed corners on sticky tires, a lot of autocrossers are getting inside rear wheel spin when trying to put the power down. So far the LSD has allowed them to get that power down and launch better out of the turns. It really helped so far, from what Randy has been saying. He hasn't found any big side-effects. The traction control is prevent you from spinning both rear wheels which is probably more difficult to control that spinning just the inside wheel. But at least you can switch it off.
Conventional wisdom may tell you that an LSD is actually worse for track driving, so we'll see how it performs on the track. So far I have only heard autox reports.
'05 Lotus Elise: RS134 Monolites, Nitron Singles, Monoballs, V2 arms, RTD2 brace, Innovative motor mounts, V2 tank, GPan, Larini 8", TransCables, LumosHID, GiroDisc, Ferodo DS2500, etc.
'16 Porsche Cayman GT4