First impressions are, lovely smooth responsive engine, torquey and flexible but obviously without the extra 20 bhp of the 790.
Comfortable riding position for me at 6' 2" though the seat is crap, same as most KTM's. Screen works pretty well at speed. Handles well on road and off road though only done easy trails so far. It feels small and light even though it isn't light. A little snatchy throttle response low down but I'm getting used to it. I love the looks in red and white.
I'll be honest, I bought it because it's so much cheaper than the 790 especially with the early pre order discount.
Time will tell over the course of the next year as to how good it is and the shiny new toy syndrome has worn off, but early days, I'm very impressed.