Email for Gmail allows users to read, reply to, and compose emails. It comes packed with some amazing features that make it convenient to work with Gmail.
Features
Access mails from menu bar
Receive notifications in Notification Center on arrival of new mails
Mobile and desktop mode
Open multiple windows for different mail folders
Create hot key as a keyboard shortcut to open the app
Email for Gmail has possibly the nicest UI of any of the menu bar gmail clients I've seen. And performance is very good. The initial version lacks an essential feature (for me) in mobile mode: the ability to move a message to a folder. Once that is added ,this could well become my main email client.