Tienda is very customizable, as it has been built on the MVC framework which allows for easy template overrides.
Another very important factor for me is the communication from the developers. I have submitted several bug reports and feauture requests and the team at Dioscouri have always replied to me in a polite and professional manner
There is also a clear roadmap and the development of the component is very active. All of this can be seen at projects.dioscouri.com.
I very highly recommend Tienda Ecommerce. The Joomla CMS plus Tienda is a very powerful Ecommerce combination.
Thank you to the team at Dioscouri for all your hard work!