I just looked at the Shimano techdocs for those hubs. They are quite strange.

The 'C' in the name indicates they were designed for comfort bikes, which isn't a good sign for touring use. The 900 indicates they were a high-end offering for comfort bikes (compare to C-050 parts commonly for on X-Mart bikes). The rim paired with them is likely of comparable quality. They're probably good for general use, but I wouldn't expect them to be bomb-proof.