We rotate two goats on two 1/2 acre fields and within two weeks they have eaten most of the grass/weeds. In the spring the grass grows as fast as they can eat it. The major downside is they will kill small trees by eating the bark off all the way around the base.
The pic above is one of the fields in spring and we just put them in there. It's not as fast or neat as a lawnmower but one of the fields is our dog's field and the other is my daughter's play area. Neither of them need to be manicured but we also don't want to be mowing it all spring and into the summer. So our little hooved buddies are a great compromise. They are also great kitchen waste composters along with our chickens.
We got our first one when my daughter was three and she was out playing with them w/o any problems other then her foot got stepped on occasionally.
The house in the background is big enough for a full sized lab and two mini-goats.
