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I've got a 2004 150hp ficht with 976 hours use, At least that's what it says on the diagnostic print out, Which was done during winterising in January after being left tilted since september she started first time no probs, And sounded sweet as, As for economy I can easy get more than 1Nm per litre mid range and about 1.3 litre per Nm at WOT.
So personaly i recon my rude engine has prooved it's worth with only a few expected spare parts over the years, I do agree some parts are pricey, but arnt they all,
plus they take off like shyt of a stick,
Best of luck deciding,