Lock outs are nice, because the tires are locked together. Perfect for sand and loose dirt type conditions. The bad part about limited-slip diffs is that either there needs to be some actual slippage before they work, or they stop working if 1 tire totally give sup (helical cut limited slips are what come to mind for this) so you're already losing traction before it starts to rectify the situation. Lockers are there right from the start. Enjoyed the locker on my old 03 Toyota Tacoma and 10 F-150. Really handy on the dirt. Wish my current truck had that option, but it just has a regular torsen limited slip rear.
