Only in demonstrations I guess. Also the guy that had the ISO driven CAT last year was using them with a hydraulic hitch to keep the planter following the tractor straight since the tractor was on RTK.

If they are dependable you could use them for following corn rows during pre and also early post. Crop is going to have to be pretty big to not be damaged by tactile sensors I would think. Deere is putting units out with tactile sensors this spring. Supposed to be working on sonic.