ya know i recently plunked down for the uber-expensive level hub and frankly i think yours is a cleaner/nicer/lighter solution to the problem of thread on cogs!
the level hub is nice and it spins ofrever but with only three bolts holding the cog on i notice i have to keep tightening the torx bolts on it after every 2-3 rides. i recently regreased them heavily and the problem has lessened but i bet if i had 6 bolts as opposed to 3 it would never happen.
plus level is not making 1/8" cogs for the hubs (contrary to what the website may say).
i have nothing against the level but it seems really expsensive for what it does and i bet yours does all that just as well while wieghing less and costing a fraction as much.
good for you! i don't understand why some manufacturer (surly? kogswell? phil?) doesn't hop on this ides and make a hub and some cogs to work using this principle. seems infinitely superior to thread on cogs to me.