I've had two sets on my 919, and loved them.
But, the last ones I rode on were from some years ago, so I don't know if today's 2CT is the same or not.
I'd suggest being careful on really cold pavement, especially in the wet, until they are warmed up a bit.
Also, seeing as the tire has been around for so many years, have a look at the date code info on the sidewall so you know when they were made.
Last, did you stay with the original sizes?