I was expecting something that just tells you when you have a new message, and then takes you to gmail. Pretty straight forward right? But this addon takes it the extra mile. Not only does it tell you when you have unread emails, but when you click it, it doesn't take you away from your work, it simply displays a list of your emails! With subjects, correspondents, and more: when you click the email, you can read it right there in the addon! No need to go all the way to gmail! The only thing I like gmail.com better for is the drag and drop organization, but this addon can still organize, you just have to click one more button.

Overall:
Easily the simplest, most elegant email addon I've ever seen. I have and will in the future recommend this to my friends and family.