'Fine' is not the word of choice to describe how one feels on a bike at 100kmh. You start clenching your ring at half that speed...
A word about light hubs - folks shouldn't really count them as rotating mass. Sure, they rotate, but doubling the weight of your hubs will do stuff-all next to doubling the weight of your rims.
And light hubs come with drawbacks, particularly for all the folks using Shimano cassette splines - making them out of aluminum (without the steel strips a couple of companies use) is an example of a product designed to be sold rather than used. And don't get me started on the unserviceabilty, and poxy sealing of most cartridge bearings...
The industry standard of merely quoting whole wheel weights is bogus; it's of interest only to weight weenies. Nothing wrong with that per se, but I want to know how much the damn rims weigh too.