Push notification is a proven smart way of marketing and ensuring no important product, news or information is missed by your customers, clients or readers. It is the smart way to be in the sight of your customers/readers because the information you want them to see must reach them.
I love the idea of sending push notification when there is higher likelihood of clients seeing/clicking the links sent to them. This will ensure good average recipient of the notification and it is far better than sites with no push notification
I will recommend push notification to any site owners and it is good to start with Openback. Nice hunt!
RE: OpenBack - Helps in Sending smart push notifications