In the majority of our cars it is a point of failure as the lines from front to back get rusted out.
Also those who are more performance-minded find that it is a nuisance when racing, leads to understeer, unpredictable activation, makes the rear sloppy... Removing it entirely (with a AWD DSM rear subframe) reduces weight but blocking it off is a common solution.
It is great to have for slalom conditions (i.e. driving like a total jackass on the highway /ubbthreads/images/graemlins/smirk.gif) and makes for fun drifting AWD donuts in the snow.
If you don't have a need to remove it, I would say keep it while it still works.