I’ve got the model c’s which were a lighter iirc; they share the same px sl hubs i think. The bearings gave out in a few months of regular use and needed changing. Been running fine since and i only swapped the bearings for some cheapo ebay jobbies, so god knows how rubbish the px ones were. Not a hard job to swap them, but don’t expect px to offer any assistance on what bearings etc, why would they know what was in their own branded hubs, the pricks. But fortunately Google leads you to a few threads on branded with all the info you need as it seems i’m not the only one to have to do an early bearing change.
Edit – much as i would say the model c’s were fine for the money, i take the askiums at that price over them everytime.