I have always considered the Cv as the weak link in the transmission, and as such we have strenghtened every thing else, (diffs, half shafts) , my concern is what will be next on the list of "must haves" when the cv's stop breaking, the cv is accessable and relatively easy to repair and it pays to have a spare or two behind the front seat, What if the last piece in the jigsaw of bits to fail turns out the be the centre diff? if one of these goes clonk during an event then the chances of effecting a repair are less than a simple cv