I loath goats. They are the most destructive animals around. They are an indicator of the poverty of a country - the more goats, the poorer the country. If you want to create a desolate wasteland, get some goats.
The only potential use they have* is to put them through a well secured hayfield, before it really starts to grow - they'll get rid of the thistle and ofther weeds, so you get a better haycrop.
I used to round up wild goats - we could get 400 in an afternoon - and they only way to contain them was good fencing and dogs. Working them in yards required the sheep pens to extended upwards to about 5 feet - they would jump anything less.
* I forgot angora, which is a good wool, but obtainable from less obnoxious animals.
I am really tempted to get a couple as well, its just the milking!
I think I need to build an automated milking system, as I dont do early mornings. (a bit like for my automatic hen coop door)
Good for keeping the grass short? Will see more next week how the get on.