Great--I'm sure you'll like them. As to the grilles, acoustically it doesn't matter. The effect of the grilles has been reduced to a point that you might detect a difference using a test signal like pink noise, but with music, it's extremely unlikely you'll hear any difference. The attenuation of high frequencies with the grilles on is a fraction of a decibel in the uppermost octaves, where there is little or no useful musical information.
Axiom Resident Expert