Bought this for our new house. Installation was medium difficulty and I'm not a super handy person.
In terms of usage, it works wonders. You can record video when motion is detected; however, it's a $30/annual (don't know if this has changed), so for <$3/month, it's well worth it.
I've never had connection issues, so depending on the distant from the doorbell to your router may be an issue, but a network repeater will solve this with no issues.
In terms of power/voltage needed, on first installation, I kept getting a notice about it getting low voltage, but after a day or two, it was sufficient, and everything is green.
If you're cautious like myself, get one. It'll save you the hassle and worry of your own home.