My presence has been great for some time. Have the beta app on both mine and my wife's phone. The location actuation has been very consistent.
One thing I found out earlier. If I happen to set the circle too close to home it would have problems. I think what was happening was not so much the location but the connection. There was a point near the house where my phone would try and re-connect to my wifi. Can't say for sure that is what caused issues, but a thought.
I have the circle at about 450 feet which works great.
