Hay, You pretty much nailed it. The EP-600 has a more efflortless feel to it, and goes deeper, with more impact and tactile ability.

There is rumor that Axiom will be allowing the DSP in the 600 to lower the current 17.5 Hz cutoff to 16 Hz, which will allow the 600 to pick up the lowest note on the pipe organ.

If you have the space and the $$$, grab the 600.