Dura-Ace Track Nuts are amazing. You don't realize how good they are till you use others. For example, the nuts that come on the Zipp 900 disc have very narrow shoulders. So, if you use an angled 15mm wrench, the wrench easily jumps off the nut when you apply force.
Also, they don't seize up over time nearly as quickly as the Formula and off-brand nuts will.
If you have the extra cash, they are worth it:
https://www.benscycle.com/p-1532-shi...e-hub-nut.aspx