Just a sublime module. Perfect for sound shaping or for creating dynamics within anything in your track (by modulating the vca's or processing the odds and evens outputs differently, for instance). I can safely say that mine will never leave the house, just a brilliant piece of kit. 

Yes, it's a killer module. Unique aspect is to do frequency dependent envelope following.
As far as i know only other module doing this is the Buchla 296 spectral processor.
But it's a power bitch!

A Eurocrack Pusher: "The first time is for free" ;)

Just got mine a few weeks ago but already loving it so much. I'm very much interested in using my modular as a live instrument for experimental soundscapes and drones, and the 601 really made my synth infinitely more flexible.