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)
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!!!