I neglected to add the most important reasons that the Poly Evolver merits "classic" status. First and foremost, it sounds truly exceptional. Strings, brass, organ, bells and chimes, FM piano, pads of both the analog and digital types, and sounds and effects of all sorts are strengths of the PEK. The modulation possibilities are deep and varied, including a sequencer. It has an onboard delay which can produce related effects such as chorus or flanger. It's a pleasure to program, due to it's well-ordered knobby control panel. It has a decent full-length keyboard with velocity and aftertouch. It's expandable with Mono Desktop or Poly Evolver Rack versions so that a five, eight, or twelve-voice instrument is within reach. And then there are the stereo oscillators and filter. Last of all, it also provides an impressive if small-scale red and blue light show.
Gee, now that I've started, I could go on and on naming reasons the Poly Evolver deserves to be regarded as a synthesizer classic.
I guess that can be expanded over to the whole Evolver series.
I would have to agree with this choice, and not because this is a DSI forum. To some degree, the Evolver may earn a similar status as the Prophet VS. It was around for much longer though, and wasn't necessarily misunderstood upon arrival. In fact, I was curious one time and double-checked some reactions all over a couple of gear forums after the release of the Evolver. While reviews were almost always positive with regard to the whole series (especially the keyboard versions), so were most user reactions. It must have been the resurgence of more "purely" analog synths that might have caused a shift in the perception towards the Evolver. Suddenly, it was mostly compared to rather traditional VCO machines and all that. And by now, some of the unique features almost seem to be forgotten, like the stereo signal path for example. Even Marc Doty had no idea about the Evolver at all - I once asked him about it, since he is totally in love with his Pro 2.
More important than any of that is probably that the Evolver has a truly unique sound, which I would descibe as a sort of bastardized version of all kinds of synth sounds that appeared in between the mid-80s up to the early noughties: From pleasing analog-only sounds to nasty industrial sounds and everything in between. A lot of that has of course to do with the almost digital vintage sound of the VS waveforms and everything Sacred Synthesis has already named.
That it's becoming sought after is already quite obvious. Especially the rack version is very hard to get by these days. And if one finds one, it's usually rather expensive. Not on the nasty side, but definitely not affordable. I name especially that version, as it seems to be the one that makes most sense for those who already own either a PEK or a MEK. In fact, I believe that the combination of especially a MEK and a PER is amongst the most potent and economic portable powerhouses one could imagine. And in general, the Evolver offers quite a few features that have neither been recycled by DSI themselves nor by other manufacturers, which makes its unique selling points still valid.