The problem i have with the surly hubs is with the adjustable tension on the bearings.

If you look at the axle on any quality cup and cone hub, there's a groove on it.
Thus, you can have a fixing nut, special washer which interacts with the grove, and the cone.
The washer prevents the movement of the outer nut from tightening the cone into the bearings.

The surly hubs lack this feature, so they have a tendency to tighten up on the bearings & ruin them.