First thoughts; "wow" - thoughts after a few hundred Ks; "wow"
Seriously, there Rush are my new favorite running shoe. Before going forward though; I run mid-forefoot, own a few pairs of minimalists, and generally go for lightweight low-drop racers, even for my longer distances. This might not be a shoe for everybody, but any advanced runner looking to up their game, this is a GREAT shoe.
I loved the very dynamic character of the running shoe. It feels like I'm literally wearing an extension of my feet. The comfort of the insole and the construction is definitely A1, and I feel that the light and flexible material used for this shoe is one step ahead from the Cloudracer (which I did enjoy).
The shoe's responsiveness is one of the thing that struck me. Thanks to its flexibility, it definitely gives the runner a sense of control, and of moving from the foot (and not the shoe) in the strides, whether on the track, sidewalk or light trails even. The On Speedboard is definitely a great piece, although this shoe's midsole might not suit everyone for the long distances. Still, it's one of the few racers that I don't find too clunky to be a racer.
I wear them daily, to got to work, to walk around, to commute, to run. I take them off before I go to bed, that's it.