I would argue that Graupner carbon props are the best props available IF you have a clean lake and aren't pushing huge power though them, if you have lots of floating crap on the surface or are putting more than about 1kw through them they won't last long though. The K series 1.4 pitch are better than the S series 1.6 pitch versions.
Strangely the very thing fweasel doesnt like about them (the flex) is what makes them so efficient, the highest load on the prop is under acceleration and the Graupners flex a little and reduce their pitch ruducing current and cavitation resulting in a boat that accelerates better but gets better runtimes, they are so good a friend of mine made some moulds of the 2318.36 he was using in his Mono1 and had some cast in alloy, his alloy props looked and measured exactly the same, but he couldnt get runtime and he lost speed. Likewise one of the TP CNC ranges is a rip off of the graupner K series, and is amoungst the better of the aluminium alloy CNC props but again they dont quite stack up to a real Graupner 1.4 carbon.
Paul Upton-Taylor, Greased Weasel Racing.
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