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KOMs are much tougher than the weight would indicate. I have them on my Salsa, which takes a LOT of touring/shopping weight and curb hopping, my Kona, which is a rigid singlespeed I abuse to the fullest, and I had them on my longer travel hardtail too. None of them have gone out of true or felt noodly. Just put i21s on Kate's new tourer and I'd have got them for my new full sus, if I could find them at a reasonable cost in wide 29" flavour.
And they look ace.
£13 WTB KOM i21 rims from Planet X and whatever hubs you want.
Or I think @DisappointingBob is selling some barely-used wider KOMs on Hope Hubs.