I've got a set of the Low Flange hubs also. they were stock w my '04 track pro.
I like 'em a lot. They are pretty light. Also as mentioned before the hubs can use any cog. With the Miche carrier/cog system it is really easy to swap cogs (no chainwhip needed) and after you have the carrier (the threaded part) the cogs are less expensive than other cogs.