I went with the Ring system about 6 months ago and am not disappointed. I went with their cheapest door bells ($99.99 each). For the first month you get all the bells and whistles, then after a month you cannot store video and only see the live event. It cost $3 per bell or camera per month, or $10 per month per house. I have 4 to cover all areas of the house and it is great. They are easy to set up and install. If you do not have door bells at your house, you will probably want to add the $49 solar charger for the devises, or just plan on loosening 2 screws and charging the video door bells every few days. You can purchase a wireless chime devise for the video door bells, or just use your phone. However, if you house is wired with an existing door bell and chime, they will be compatible.
You can set the alerts to your phone with distinct chimes, vibration, or nothing at all. You can block out most of the road in front of your house, so you are not annoyed by cars passing on the road. We like ours.