I find the e609 is not much of a departure from the 57, and maybe even a bit darker, and I don't like what it does to the mids.
Again, like the 57, you have to really find the one spot where it sounds good on a cab/speaker....but with my other guitar amp mic choices (the Fat Head or D1000E), I find I can put them anywhere, and they capture the sound from the amp without coloring it in some positions.
Of course...guitar amp tone choices are a personal thing, so whatever you use, if you like what you get form it, then it's the the right mic for you.