Thanks for the good advice guys.
The only thing holding me back is when I'd notice the 919 after a certain lean angle becomes really testy and sensitive to bumps and irregularities in the road.
If I were to find this to be true on the track even with highly upgraded suspension I'd be thoroughly pissed off at myself for choosing the wrong bike.
I haven't heard on anyone complain about this but if it has anything to do with LDH's comments about the frame I'll have to pass. It is a streetbike after all.
I am travelling so can't embellish.
My 919 trail brakes real nice.
It transitions well.
It folds the pegs easily even with the bike set up as tall as I have it.
It is very predictable and very forgiving.
If you want razor sharp handling, get an SS.
If you want a comfy bike that can easily be hustled around quickly within the limits of good street tires, then a 919 is fine and dandy.
A well setup 919 is very nice to learn track on as well, the mental pace needed is slower.
That is not to say you can't do good lap time, just that the mental pace needed is slower.
For example, gear changes take longer to get to as compared to a 600 and up SS, especially as compared to 750s and up.
I have not had the 919 on real high speed turns.
My guess is that serious turns in 5th and 6th would overwhelm the chassis.