Interestingly enough, the manual that comes with the V5's still recommends to leave the grills on but I think they are still using the V4 manuals!
A definite +1 for magnetic grills! Hate looking at all the holes!!
FYI...from the newest reference catalogue and the new studio V5's
"Removable Grille Assemblies:
The latest generation of Paradigm®Reference speakers is designed to sound every bit as clean, clear and transparent when playing with the grilles on or off."