Most probably do it, because it looks better with less wheel gap in the fender.
Pros:
Better looks, lower center of gravity for more stable cornering, better aerodynamic performance.
Cons:
Cost involved with correct shocks/springs, cost involved with proper alignment, worse clearance for driveways/speedbumps, ride quality can suffer if not done correctly.
I've probably missed a few things, but these are at least some of the high points.