I tried the demo a while ago...What I like about its Unison is that it is so much more than the average unison, which are usually things like Pitch detuning, Pan spread, phase, generalized envelope randomness for all the Voices etc..With Dune2, YOu can also make all sorts of variations between all the voices, like Cutoff, LFO, ARP etc...every synthesis function really...
Dune 1 had a way to do similar things, from the Mod Matrix...
Overall I liked Dune 2..JUst wish there was a possibility to use the wavetables as FM carriers and Modulators...Dune 1 could use a variety of waveforms for FM..I feel that Dune 2 is lacking in that aspect...could have been quite simple to implement, I am guessing.