I have an MXR M108 10 Band Graphic EQ pedal.
I have not compared it to other models but it is fairly cheep, rugged, and the sliders all light up which is nice for a dark stage.
Michael
I have one of these also, and have been trying to get the most out of it. Can you tell me what setting you are using on yours?
I do not have any particular settings.
I have primarily used it to give the Rhodes a little boost in the signal, even out the sound, and remove noise.
I also find myself making little adjustments depending on how warm the amp tubes are, what the guitar and bass player are doing, etc.
I love fiddling with sliders just like playing with drawbars.

I agree that a proper preamp would allow a great deal more tonal possibilities.
Michael