Slick hardware, an excellent app and the best-known doorbell in the world. It is also a closed cloud system where recording requires a subscription, there is no local video path, and Amazon owns the footage pipeline.
We do not specify it. Where a client already has one we will integrate what the cloud API allows, and we will be honest that the integration may break when Amazon changes something. For a doorbell we would fit a Reolink or a UniFi unit recording locally.
We do not sell hardware or carry brands. Bring your list to a design session and we will tell you what is worth buying, what you already own that can stay, and what to skip.