Major Examples of Opencart (Brand stores)

Hi

I am looking between a few ecommerce platforms such Magento, OpenCart, WebSphere Commerce
I wanted to see what branded stores - major retailers that are using OpenCart.

Does anyone have an examples?

Thanks

Have a look in this forum Live shops

Shows everyone who uses opencart

What I want to know which I cannot seem to find compared with

Magento
CartKeeper
ATG Commerce
Venda Commerce
Fresca BT Commerce
IBM WebShere Commerce

Does OpenCart support enterprise level application architecture. So far I enjoy the simplicity of the admin panel and the less complex code - it really does well in terms of programming and I think it uses CodeIgniter as an engine? So scale would not be an issue.

We currently use a PHP/MySQL system. Our store takes 4000 orders a day. I am happy to stick with PHP/MySQL and so is the team providing we now Opencart will work with Nginx .. etc..

A good example of opensource scaleable web apps I have seen so far is Vanilla Community software. Just wanted some people from dev team so feedback on this. Performance wise etc. It seems so far I have seen "kiddy" developers and amateur stores.