By what standard? In my experience, the tooth profile of EAI cogs promotes noise and does not release the chain as freely as Suntour, Campy, or Shimano cogs. Additionaly, EAI threading does not perfectly match hubs from any of the above listed manufacturers, resulting in a bit of effort the first time or two the hub is used with the EAI cog. It is normal to see a bit of thread damage and slivers of aluminum after removing the cog, which is a shame if it's a nice hub.