does opencart is a good e-cart for a big e-commerce platform?

could you tell me if opencart is utilized by some site (which are the most important-visited?) and if it supports a considerable number of sales?
I must create an important e-commerce site, but before begin develops, I want be sure that opecart is sure etc, etc...

thanks

Well there are a lot of professional and large sites out there using OpenCart. It was designed to work for large or small.:

http://forum.opencart.com/index.php/board,11.0.html

Also from a developer point of view opencart has been coded very efficiently and robustly with multi lingual features.