I was reading this review of the 603s. What about this?
"As much as I like the freak on accoustic guitar, I'd have to strongly warn against using them in a lot of overhead mic'ing situations. The 603 is great on snare. It's got more slap, snap, and pop than you can handle, so that's not the issue. Where it really disappoints is in the way it reacts to cymbals. Place a cymbal anywhere in it's vicinity, and it's like the freak is a hungry kid at fat camp, and the cymbal is a candy bar. What can we do? The freak has a cymbal fetish.. Do not use in the presence of loud, bright, cymbals unless you want them to dominate your mix."