I havent had any get hard from light exposure or start to fade, but most of what I use it for is under the hood or inside the car. Might be something to consider on a motorcycle though, for sure.
My only gripe with it really is that, being braided, it absorbs liquid. Not such a big deal but again, another thing to consider for a bike install. Its nylon so the amount of liquid it takes is minimal, but with oil it stays greasy for a bit and cant be simply wiped clean like other looms.