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@Smallfurry
I'm not sure the rim itelf is stronger to be honest, and the braking surfaces should be equally good. They may build up easier though, which would lead to a stronger wheel. They do have double eyelets as opposed to the single on open sports. This reinforces the spoke rim contact area which is the bit under the most stress. So again a wheel built from them could be more resiliant. I've read stuff about spoke nipples being able to move in the rim easier with double eyelets, which reduces the twist which can build up from tensioning the spoke (This sounds a bit over the top to me though). I confess an important factor for me, would be that they are 65g lighter (a fair amount on a rim).
I think bang-for-buck wise open sports are fantastic rims. I just personally feel I would spend the little extra for the upgrade. But then I have a titanium axled BB with ceramic bearings in my steel fixie skidder bike. So I'd in no way recommend my bike-part spending habits ;)