Don't know how useful this is, but these are my experiences on the string machines I've owned or played with enough to form an opinion.Logan String Melody
Soft, lush, ethereal. Probably my favourite string ensemble sound. Doesn't cut through the mix as well as some others. But man, I just love the sound. I've played on Melody II, but long ago and can't really say how they compare soundwise.Hohner String Performer
Very similar to String Melody, but not as soft. The string sound is "heavier". Ie. more bass, has a bit of a grinding quality to it, but the difference isn't huge.Crumar Multiman S
(same as Orchestrator)
A bit weedier than the Logan, more "real" sounding. A great feature set. And the strings cut through really well. You can't adjust the attack fully, IIRC, but the tone controls are nice to have. A nice underdog solution.Solina String Ensemble
I've had two that were rather different in sound. One was very lush and with a deeper chorus. The other was weedier and the ensemble effect didn't seem as deep as on the other. I like the Logan better, but the Solina works on just about anything.Korg PE-2000
Fantastic phaser, but without it the strings were rather dry sounding. Other polyphonic sounds lackluster, but still with some of that old-Korg character. An oddball.Moog Opus 3
As a whole, probably my favourite ensemble synth. The synth (aka brass) section is really nice and the strings, though a bit weedy, cut nicely. The ensemble effect is great and the string section has its own switchable (non-articulating) multimode filter. Bandpass sweeps, baby! I have a couple of demos up on soundcloud:https://soundcloud.com/matti-juhana/moog-opus-3-demo-1https://soundcloud.com/matti-juhana/moog-opus-3-demo-2Yamaha SK-20
The organ is the best part here. The strings are alright, maybe a bit like the Crumars, a bit weak though and not what I'd call lush. The synth section is alright, but the Opus sounds better to me.Arp Omni II
Great strings, similar to Solina (but not identical) and a nice synth section. Classic sounds.
I guess my next stop is a Roland stringer as I haven't had any of those. Maybe the little RS-09...