@Marc: I own 3 Core (4 now with the new XR4 11 that arrived yesterday
), so I have a good feedback about these kites. Quality is absolutely at the top: my old 11, 5 years, is like new, I switched to the XR4 just because I wanted a new kite. I hope it is really different, otherwise I wasted my money. About the QR, I agree with you: it works perfectly but it should be better to follow the pack, muscle memory is very important. You're also right about the extensions: a very tidy system but it takes too much time to add or remove. About the size of the bar, I owned an XR 17 that I then replaced with an XR2 15: absolutely no problem, the kite reacts quickly and you're in perfect control, no need for a bigger bar IMO. Can't report for the moment about the pro bar. I received it yesterday, the lines are really impressive, very thin but very stiff, sooo different from every other line out there. The price was 100 euro more than the standard one, so I decided to give myself a treat.
I'm going for sure to test it neck and neck with the standard Sensor bar, will report asap!