I am a long-time Joomla! user and looked into this issue last year around this time. At that time (much may have changed since), the e-commerce solutions available for Joomla was a messy landscape. I tried a few different solutions, but did not like them. When I arrived at Ecwid, I found it super easy to install and use, both for myself and my client. YES the urls are messy - hopefully they clean this system up soon - and YES their SEO is really difficult/impossible to manage... but I went with it for ease of actual commercial functionality. I will say it is still really nice to use and the development team uses user feedback to show what's on deck for implementation. Not sure it is still the right choice... maybe something better has come along? Interested in others' recommendations.
