Only thing that can be small problem is it doesn't have a plugin for sh404sef if you are running this extension. since it is popular by many joomla site owners i would suggest to make one.
I think it needs to deserve more ratings.
just a suggestion, it will be good if you can make a better pagination for SEO (each page will have it's on unique meta title and description and rel="next" rel="previous"), also put the pagination on top and bottom and make it bigger so users can see it)
Thanks for your feedback and suggestion. SEO friendly pagination i.e unique page title, unique meta description and rel="next" rel="prev" have been added to our latest version.
at first i had to customize it because i chose a them that is a little complicated (sandwich) but stan really did everything to help me quick and the shop is now perfect.
i had different one page checkout solutions in the past and they all had troubles, but stan's extension is the most stable and reliable.
I highly recommend it!!!