I wouldn't buy the bike until the brakes meet your satisfaction with the tires you will be using. Sure they can be tuned and improved, but that can be a huge hassle and may never be totally solvable. I don't ride my CX bike anymore because no shop has been able to fix the brake issue (front tire skips on pavement with heavy braking) - it only happens with 25/28c tires on pavement. CX specific tires the problem is not there. New fork (no charge from Trek), new pads, multiple adjustments, new hanger, check headset, etc. I just got tired of trying new things and it felt very unsafe.