Working well for me so far in Gmail

This add-on is quite simply, brilliant. It lets you write Markdown in any text field that supports HTML/RTF.

I had been looking for a way to to work in Rally with Markdown and this was by far the easier option.

CTRL + ALT + M is now my favourite keyboard shortcut! Tables in Gmail are now easy!

Works great in GMail too.

This is a sweet addon... helping markdown the email at the click of a button :)

wish it could do markdown on the fly or not lose changes if you add on markdown after initially rendered. works well though!

One of the best extensions I've ever used. Works perfectly, highly customizable (via the css sheets in the options); it's made my emails my favorite markdown editor!

Pretty good for using 'Markdown Here' ! Use this plugin to write a mail is very cool and beautiful !
I like it , I give five stars.