I like it. Used it for >several months. If you have used mou before it is similar. You can edit the themes (ive downloaded some from github) and you can configure a couple markdown flavors out of the box iirc.

It renders in place in real time unlike some of the ones that load on half of the screen.

Worth a download. They smoothed out a lot of the issues with updating content & cursor movement.

Best markdown editor ive used, if viewing the rendered markdown matters to you. You can export as a pdf and a couple other doctypes which is nice for sending to non-technical teamenbers who have no markdown reader.