I don't know the Bontrager RL wheels so I cannot comment on them however I have rebuilt a few sets of mavic ksyrium. I think they are good wheels, the rims are stiff and light. hubs seem to be pretty reliable. The trouble is when you need to fix them, not easy to find components and they come at a cost. For the weight of the wheels they are pretty stiff and they should last quite well. One guy I rebuilt a set for, owns a few sets already and he was quoted silly money to rebuild the set but he imported the rims from the USA for £230 - £250 and I rebuilt the wheels for him. I did another set for him after that. I had done a couple of sets before that and the same story, it takes a while to find the components that need replacing.