yes, that is impressive. i am a linguistics major and one of my professors from last semester is working on natural language processing and this level of recognition. but the actual work the thing is doing is very simple computational work, so it doesn't seem insanely useful in that respect.
Well it's not the computational work that's supposed to be impressive. It's that Hound is able to do voice recognition in an impressive way (e.g context, details, multiple prompts)
I have been to a demo of Cortana at Microsoft Chicago. They focused on her ability to understand language, it was very impressive but much slower than this. (Not unbearably slow on its own, but compared to this)