Slew rate is just one aspect of a power amp. You have to look at the whole design of an amp. I don't look at specs when I check out amps. It's much too easy to fall into expectations before you even hear it. Most times they pull these figures out of their buttocks anyway. I would suggest you listen to amps and catagorize them based on their design. I'm using a mosfet style amp now. To me they sound warm yet detailed with the monitors i'm using. On other monitors i've heard them on, they sounded too dark. But not all are created equally so it's hard to generalize this way too. this leads to another point, the monitors and how they react to different styles of amps. Don't forget about your room too. All of these play a factor on how your amp is going to sound.