Hi ,
To add to what Nebu has posted , a very great advantage of slicers is that they do not have to be on the same tab as the pivot table ; thus , if you are into creating dashboards , they are an asset , since control of pivot tables can be handed over to the user without the user ever having to even know that they are dealing with pivot tables.
The simple fact is that once you start using them , you will fall in love with them , and you will wonder how you were managing without them !
Narayan