I've had deer run from them and had deer stamd there amd watch me ride past. In farm country wr use them religiously for crossing fields and dropping off/picking up hunters from the stand. It doesn't spook the deer nearly as much as walking a field edge.
If they are used to noise and heavy equipment no big deal.
This is my experience on a farm as well, and it’s annoying. Deer that just lay or stand there as you idle by in a truck or quad will blow up and bust you if you try to walk the edges of the fields.
