£1.5k is still a bargain.
I cycled one round Sloten at Cyclevision last year and it was fine. Not a race machine but does a job. I believe the recumbent shop Lifgfietswinkel has sold a few.
Pros...
• State of the art all enclosed drive system with Rohloff mounted within frame. No more dirty chains or clothes.
• Boom length stays same and seat moves so easy to adjust.
• Distinctive 'award winning' design which means not just another recumbent. People may actually look at it
Cons
• High b/b height due to fact chain runs straight
• Some drive noise because chain is within machine - may be hub gear too as this is not noted for being silent
Flevo are a company to watch as they really went into great detail on the Greenmachine design.