Got mine for about 230 US $. Here that would be a Volca (with adaptor), not a minilogue, which would be about 586 $ from new. Though, a bought a third arm for about 76$ but that one is off again.
Absoletely not bad at all. Had never payed attention to it until I searched for synths with Karma 2. It is one of the best sounding rompler synths I have put my hands on. Further, I have expanded it with the Radias module, which adds a 4 part, 24 voice polyphonic VA engine to the arsenal. Apart from this, it has a sampler, which I have expanded to its max about 320 MB. It has a piono roll step seq too. But best thing is, I feel like being in a 70s sci fi movie when fiddling with it. It looks like this ancient NASA board or somethingI'd never looked at the M3 before, I'd probably assumed it was some old thing like the M3R but, doing it a bit of research, it seems kinda cool and the fact that it has held it's value pretty well indicates it's probably not bad at all.