This is one of the most underrated pieces of kit ever made in my opinion. Got mine on reverb for $215. The fact that it also has 2 inputs to slice and process is another plus.
Anything w/ an ER-1 in it gets a thumbs up from me. :-) The "synth" sounds (or should I say "sound effects"?) of the ER-1 are pretty amazing. Would like to see it being used as a full blown drum machine more often though...