My CNC router came with cheap thrust ball bearings. After replacing them with the same original brand bearings which failed after only 6 months, I settled on standard bearings. I can't comment on durability as I've been on vacation since installing it. I can say that the bearing is superior in quality and design. I expect this bearing to outperform the factory bearing it replaced. The bottom line is that when you buy a cheap car you will quickly see where you are saving. Bearings are cheap so I'm not complaining. I got about 1500 machine cycles from a cheap original bearing. I'll be counting cycles with this new stock.