I swapped out my stock bontrager tires for GP4000S's, and I won't ride on anything else anymore. The grip when cornering is unbelievable, couple of times I have thought mid corner 'I'm going down', and suddenly it feels like someone from above grabbing me by the jersey and saying 'Oh no you dont!!!'
I hope they loosen up a little for roadside flat fixing reasons
Don't worry, it gets a lot easier, they loosen up quite a bit