It does what it says - push notifications. Tested for last 2 weeks - works very reliable and notifications are almost instant. It is also a price-wise alternative - you get 4 notifications daily for free, or you can buy 0.99USD subscription and get unlimited notifications.

This app is okay, but not really up to the job, i use an app called AltaMail, lets me view all my email in a signle inbox and also file email by contact