Support is very good and quick. they are ready to answer any quistion. I found some difficulties while using Arabic in my site, but they guide me quickly and now it is perfect.
I am using xmap for generating my site map, I found it much better than jcrawler which is generating a lot of errors with this extension.
It has nice feature where you can change the title and meta tags and keywords for each page of your site very easly in one location.
Finally, I highly recommend this extension for all joomla site especially if you are suffering from duplicate contents in joomla.