First, I will advise all Joomla community users not to look further, if you are looking for the best core ecommerce solution for Joomla, do not look further.
Quick2Cart is the best ecommerce solution for both single and multi-vendor shopping cart needs, very nice and easy administration, support is awesome with instant reply through their ticket system, regular updates with new features, and much more important, it is the cheapest shopping cart available within Joomla community.
I am not only a user of Quick2Cart but many other extensions from Techjoomla, the Techjoomla team offers very nice extensions, they are very motivated and listen to developers needs.
To resume, Quick2Cart is just perfect and should full fill all required needs, we are even contributing to the development of Quick2Cart by adding some more features as per our own needs and will definitely continue to support the Techjoomla team as they deserve it and for me, they represent the real Joomla community spirit, which is, listen, develop, support and give entire satisfaction.