Howdy Philip. I'm afraid the Nano is the only Kontax that I own, but I'd certainly not be adverse to owning others, based on this one's obvious qualities! It seems that the German Inpro Solar low temp Stirling kit may be a bit of a disappointment after looking at it some, but I'll reserve final judgement until after I get it up and hopefully running. It doesn't seem to be as nice a build quality as the Kontax version looks to be, but time will tell.
You surprise me Daniel as i thought you would have a few more!!

Shame about the Inpro, i think that is a nudge for you to get one of the Kontax LTD solar models methinks!!

They are currently offering a free glass dome with them ATM, i got one with my Nano.