If your in hilly country you'll probably pick up alot of dirt with a ridgid head. That and leave a few beans in the field if the pods are low to the ground. If your beans are down it will be a real problem. With a 13' flex head you can harvest beans without an automatic header height control. It's at times a tough job but it can be done. The auto header busted on our 510 this year and we didn't have time to repair it during harvest. We got it done without it but it was very aggervating.