I'm not an expert, but the results sounded pretty good to me.
Note to make this work you need a special cable (see p. 7 of the manual). I *think* something like this: http://www.sweetwater.com/store/detail/STP201 is what's needed?
That would allow hooking up any of the library's other pedals and enabling/disabling them as a group. This doesn't look like the kind of thing people will have laying around, so it would be nice to include one.
Direct link to manual pdf: http://www.ehx.com/assets/instructions/enigma.pdf
Your choice of low-, high-, or band-pass filter with cutoff frequency controlled either manually by an expression pedal (not included; I have a Yamaha FC7 which worked fine) or by a sweep triggered automatically by its guess at when notes start. In the latter case you can choose the range and tweak the sensitivity of the triggering.
Executive summary: lots of cool "pew pew" sounds. I like it!
The manual warns that with some settings it can be "INCREDIBLY loud." They aren't kidding. Definitely keep your amp volume very low while you're plugging things in and experimenting with the settings.