I like the Tomi-cog myself. No need to make a new standard when the 6 bolt disk works just fine.

The threaded version does work just fine; but that's the thing, it's just fine. It requires specialized tools, and has a small inherent risk of expensive damage to parts if you aren't paying attention. It's like a square taper crank, it works just great, but every time you take one off, you risk being an idiot and striping the crank. There's nothing wrong with it, but if I had the money, I'd go to a splined or bolt on interface.