This is my first "smart" doorbell. It takes several seconds (10+) between the time you press on the button for your phone to show the notification or the Amazon echo to say that there's someone at the door.
It requires an ongoing $4/month registration to be able to record your videos.
The biggest problem is that the speakerphone is rather useless. The people at the door just can't understand what you're saying. Audio quality is awful.
The movement detection is pretty cool otherwise.
Beware if you're security conscious. Amazon (who own Ring) is known for privacy breach and have been working in the US with the police, giving access to your recordings and camera. If you are (and you should be), this isn't a product for you.