I can't believe how powerful this extension has become. In the three years I've had it installed, it had gone from clunky and awkward to a mastered piece of technology.

Pros: I have 7 Gmail accounts linked to this extension and it checks all of them constantly. I never have to open my accounts in a new tab unless I need to reply. Otherwise, I can view an email - in full - and choose whether to mark as read, delete, reply, open the inbox, or any other number of functions before I open a new tab. Lightweight, simple code, unobtrusive, and no obnoxious bells or whistles. Just all the functionality you'll need to stay apprised of your Gmail new mail information.

Cons: This extension used to be a disaster. Not anymore. I'm not sure what the dev has done, but it's more functional than ever. Honestly, I can't find a single drawback to this addon.

Summary: If you have more than one Gmail account, you NEED this. I just donated to it for the first time because it has become an incredibly useful tool in my daily communication.