Had one when they first come out mate. Very good.
First mono synth I would go for though would have to be Studio Electronics's SE-1.
I have to say... I owned as SE-1X, sold it for £1200 and replaced it with a Pulse+ for £200 which isn't all that different. The Pulse, IMO, is the better mono-synth. As others have said, you'll know why if you get to play with one. WOW!!!
Composer, Producer, Sound Designer