This works, and we use it in some areas on our farm. This works really well around the outer edge where they do not go often to clear back the elephant grass, or in between the
trees in the orchard where we do not have electric wire the moment.
I recommend this if you do not have away of using electric fence, and if you take them into areas you do not often take them to.
The one issue is having to move it often as our 11 goats (large tractor) can clear certain areas without a lot of vegetation in no time.
I also do not enjoy leaving animals in a certain area for too long as they start eating foods they may not want or may not be good for them. Pigs on the other hand, will dig looking for goodies especially if you through some "treats" around.