Ring says the battery should last anywhere from six to 12 months between charges, depending on how much activity your doorbell receives. Those claims might be a bit inflated, though. In my experience, the battery drained to under 40 percent in about six weeks of use, which means I’ll be recharging it every three months. For my testing, I had all the features enabled, such as motion detection and quick live view access. Ring says disabling these features will extend the battery life.
Update 3/24/16 - Ring has added “Live View” to their feature set. It allows you to access your Ring Doorbell any time you wish. This solves the problem with #3 as long as you are not on battery power. Obviously, it also lets you “dial in” any time you wish to check out your front or back yard (where ever your doorbell is). This is a feature that I like as every once in a while I just like to see if its raining or foggy at the house.
Ring's professional monitoring isthrough Rapid Response Monitoring Services, and it's one of the more affordable services available. For $10 a month (or $100 a year if paid up front), you get the benefits of dispatchers on standby, and this includes video storage for any Ring cameras you might have. There's no long-term contract, either, so you can cancel any time you don't need it through the Ring website.
I’m not certain about Nest, but I asked abode about this before. They said, “We have what is called abode Signal Guard. Unlike other smash and grab solutions, the Signal Guard works whether your system is self-monitored or professionally monitored. The abode Signal Guard alarm acts just like a normal alarm where notifications are sent and the siren(s) go off until the alarm is disabled. If you are a professionally monitored customer, the monitoring center is notified of the abode Signal Guard event.”
The decision to separate the system’s brains—the base station—from the keypad is smart: It allows you to place the larger base station somewhere out of the way and put the smaller keypad near an entry door, where it’s easy to access. You can also deploy more than one keypad—one at the front door, one at the back, and one on your bedside table, for instance. Putting the base station somewhere other than near an entry door also enhances the system’s overall security: If burglars can’t find it quickly, they can’t disable the system.
2 - This kind of goes along with #2. You cannot access the doorbell with security software like Blue Iris,et.al. Now, I get that they want to sell you their Cloud service and I'm ok with $30 / year to have an off-site backup. But if you could link the doorbell into your security system you would have an actual video of everything in your possession and you could access it from any computer in the world. That would be REALLY handy for police investigations and any legal hassles that may come your way.