No vibration/sound with Notifications (newer iPhones)
It seems that notifications are not working properly on newer iPhones. Everybody I've signed up that has a model newer than 6Plus gets the banner notification, but no sound or vibration like they do on iMessage.
My wife's iPhone 6Plus gets "fully-featured" notifications; but my parents have the 6S & 6S Plus models, and my in-laws have the XR model and none of them gets anything more than a banner.