We've heard about this synth a few times but bot yet seen it in the flesh. Essentially its a true analogue 8 voice, 2 osc per voice synthesizer. Based on the voice architecture of the Moog Source, with 8 part multitimbral operation.
There's a lot of CV control available (per voice) and its a hefty beast, weighing in at around 25KG.
The River is backordered as the construction is very labour intensive bit if you want one, around €5,000 will secure you one. http://www.baloran.com