They are turning their SDN concept into one of the most incredible technologies around, a tremendous competitive advantage for them over others in their space. I had been under the impression that they were running everything on their (quite awesome) 10/40GbE switches. These are SDN capable switches from a very well funded SDN switch startup.
Turns out, their SDN stack is actually running on siRouter. They are doing some very cool bits on the software stack side, and getting about 2 microseconds port to port. On Gigabit ethernet.
I was blown away.