Had it out already. It's surprisingly stable. And fast (saw a paced 45 on a downhill).

Definitely corners differently though.

FWIW I'm a Nats level age group TT guy; there's a preconceived notion that a rear disc is a problem in a cross wind. Fact is I always run a rear disc regardless of conditions (including a 40+ MPH wind day at the Tour of Gila TT where I got 2nd). What I've found is if you're a good bike handler, the rear disc isn't a lot different than a shallower rim. The front wheel is where the control issues develop.

I've got an Ebay search out for a front disc BTW. I would think with the lower surface area compared to a 700 wheel, it could probably be ridden in more conditions.