Well I changed them today. Note to self, wielding tyre levers after a beery night is not a fun thing to do. Urk.
I changed them as a pair as the front Sirac had started to mis-shape the tread, the rear had no tread along the centre line, hence the spin ups. 5081miles was the life of them. I'm sure the wear is due to my riding style so will be trying a few different things out to do with that.
So the Battlewings. Well after 12 miles I'm almost out of chicken strips. The bike feels smoother with them on, quite possible due to the low land-sea ratio of them compared to the Siracs. I have noticed that coming out of roundabouts and bends that the front seems to want to push out more as the rear squats, this is where the Siracs would slide a little so I've got good feelings about the grip of the Battlewings.
Will report on how things feel after a few more miles.