The RMX-500 allows me to create simple rhythms, adjust meter, create wildly random effects (that are still in time with my rhythms), reverse the sounds of them in real time, add rolls, offset time... and tons more. It's so much more than just an effects unit!
The selection of DJ-ready effects out there is limited to the Pioneer RMX and Korg Kaoss pads.
The former being the industry standard with their RMX-1000 offering.
I have previously owned the RMX-1000 and although did the trick, I find the RMX-500 much more suited for the type of music I play (mostly house of different types).
The configuration I use with a Xone 92 in send/return mode provides maximum control of the effect return and sends and allows for effects that blend with the music and dont sound too in your face and over exaggerated. The feature to push down on the control knobs to add a little sizzle in the form of timed echos is very nice.. All in all could not be happier with this unit. It does EFX and moves out of the way when I need it to. Solid.