King bearings are, without a doubt, some of the best bicycle bearings ever made. Chris puts a ton of attention to detail in all parts he makes but the bearings are a step above and beyond - the level of precision and tolerances held are impressive. They also literally get faster as they are used. Many racers run their new King hubs on their practice bikes, and keep the broken-in faster hubs on their race bikes to eke out that extra second. No off-the-shelf cartridge bearing can come close.
(Disclaimer: I once worked at King and will always be fond of the parts.)