Can easily be used with plausible deniability. "Yeah, officer,I am just using it when someone rings the bell, no recording,the bell system never records,no!"
Very sturdy and reliable hardware
Offers indoor viewing stations (for the less technically adept household members)
PoE based, can be used with LTE in some versions.
Good documentation
With the automation licence (Costs a bit extra,but is "buy once" at least) basically everything one can imagine automation wise can be achieved, including API calls,etc.
Can be extended with RFID, Fingerprint, Bluetooth,Induction loops,etc.
If you want to use their cloud service you have to pay a small fee,but that's purely optional and you can easily use your own SIP solution to avoid this. Or simply don't answer your door from somewhere else.
The big downside? It's ridiculously expensive. But I mean...how often does one buy a new doorbell?