I had to give this extension a 4 star rating purely because there is an issue with the read more button. I can get around this by just changing the editor over and then going back to JCE. It gives so many more options and it makes life so much simpler if you are doing lots of articles etc. Really should be a must have extension for anyone designing a site.
Issues with the Joomla! Readmore, Pagebreak and other 3rd party buttons were fixed in 1.5.6