In short, very good to use. If your grammar and punctuation is a bad as mine then this will be a added bonus to use to help correct spelling mistakes on your application forms and emails and social networking, etc.
when I paste my 14.5 KB html code on the online site, it's hang my firefox, firefox say disable all extension, Don't do your magic when I paste a long text, I didn't want grammarly to look at 14.5 KB text.
Functionality is intermittent. Suggested corrections are sometimes incorrect or inappropriate. It occasionally freezes and locks out webpage navigation (typicially the text "edit in grammarly" appears somewhere on the screen when this occurs), forcing the closure and restart of the browser to resume activity.