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I've never flown a Stemme or the Diamond Xtreme, so I don't want to knock either aircraft. However, IMHO most people would be better served by bypassing them and flying conventional (powerless) single-seat gliders. A motorglider has the undoubted convenience of self-launching, but beyond that it hasn't got much going for it: it's simply neither fish nor fowl, plus far too expensive. BTW, may I add that all too many pilots get caught up in the 'ghettos' of power flying vs. soaring; it's common to hear people sneering away when they have only tried one sort of flying and have little or no experience of the other. Personally I enjoy both, they each have their pros and cons.