I ride a set of I9s with Stan's Arches on my Singular Pegasus, notably with a Singlespeed specific rear hub. I've entered it in this months' post 98 BOTM if you care for pictures.
It is hard to attribute the Ride to hubs and spokes but I really love the Pegasus, so they surely must be doing their bit. On my first ever outing of the Pegasus I commented how "fast" the bike felt, and that is with some fully size knobblies fitted too. Fast may be an unusual comment for a Singlespeed, but I mean it. And even in plain silver and black they look the business, plus the fast freehub engagement has a unique feel and sound to it.
So far they are holding up fine to my Clydesdale frame, no complaints. I've also changed the front from 15mm tot 9mmQR with the adaptors and that worked a treat, fit and finish was good, with decent information supplied on the web.
Enjoy!!