I'm not sure. I actually suspect it is something about the casing rather than the bearings because the casing seems a bit flimsy. Most of the reports I've read about problems have happened immediately after installation. Omniums come with the GXP bottom bracket, so that should be part of your consideration. If you are willing to risk it, this is a plus because the BB and Chainring together cost less than buying them separately but then you don't get to pick the best bottom bracket available off the back, so that is a minus.