If anyone buys one of these, please let us know if it’s any good.
What if people buy them but they are evil mowers and they eat people? Then you won’t get any responses… 
The biggest issue with any device like this is that the batteries will begin going bad after 3-4 years and they’ll be completely dead in 5-6 years. So you gotta decide if $400 for 4-5 years of use is okay to you. Unless you have a very tiny yard the battery life is going to be incredibly important. Once the batteries begin dying will it even be able to mow your entire lawn any more? Or will it only hit 80% and then die? Then you’ll only get 3-4 years of useful life.
I couple of years ago I looked into a Husqvarna robotic mower. They’re pricy, but I thought of how much time I would save. (We have at least 3/4 acres of weeds lawn.) Then I realized that it needed a perimeter wire like a dog fence.
Apparently they now have newer models now that don’t need the wire.
My wife said, “Why don’t you just pay a kid as a summer gig?”
“Oh, yeah. That.” (But a robot is so much cooler)
I now pay a teenager who seems to enjoy the work.
I saw this and thought, “This robot is probably junk.” Every once in a while, though, when Project Farm tests things, one of the models that looks like total junk aces all the tests and puts the more expensive thing to shame.
In the end, I’d probably end up tinkering with it, which would defeat the purpose of saving the time.
The price (relatively speaking) seems pretty decent if it’s any good. 1/8 of an acre sadly would not “cut it” 
for us.
Let it run every day. Set it free!
Fly away, be free!
A free range robot.
Buy more than one and have them battle for lawn supremacy!