We have had Kanines on 2 F3s and will address your question directly: they are vastly better than the OEM Kenda tires. They wear flat across the face and we're still counting miles at 15K and they are in good shape (I don't have a tread depth measurement). They have better traction, wet and dry, than the OEM tires. The one tire we tried early on was a Kumho, which was worse for wear (out of round tread depth) and traction, especially in wet conditions, compared to the OEM Kenda. As far as mileage, most riders on this form will age out of a 40K mile tire well before they actually wear the tire out.
OEM Kenda tires will. indeed, wear the center out on the tire. Although once it reaches a point, the shoulders start wearing down vs the center. We have run the OEM Kenda tires well over 16K miles.