Advantage: price and traction.
Disadvantages: understeer in tight corners which results in you having to chuck the car into corners or boot the back end around under power (both are fun but not terrible fast)
If you Rally the car or drive it on dirt the Las Vegas locker , as we call it , works fine.
If you're roadracing or Auto-X the car I would try and find a Limited Slip. When I first started Roadracing my 1200 it had the open Diff , the track we ran here in Vegas had mostly fast corners so it was fine.

Tom Grossmann , Las Vegas NV