They are quite good but I think the bigger models like the Omega 8 are quite overpriced for what they can do but hey, what do I know? The other monophonic ones are quite interesting once you´ve said goodbye to the idea of them sounding exactly like the originals. Their functions seem to be software-based to some extend, so you better don´t expect all too snappy envelopes, for starters. Tweaking a monophonic synth in a rack, using just one knob and some membrane switches ergonomically isn´t much fun either.
Stephen
"If we have an enemy at all, the Control Process is that enemy. It is vital to short-circuit this Control Process." (Genesis P-Orridge)