What is the difference between the EHX Deluxe Memory Man and the Deluxe Memory Man XO?

I'm interested in buying an original DMM, but all I can find so far are these other ones.
the original one u want is discontinued.

the XO is the same pedal in a small case, go for it or else spend a little more on ebay... but it is the same thing (i've A/B them)