Social proof that WooCommerce / WordPress for eCom is robust

WordPress developers that I trust are recommending WooCommerce to replace the current ecom site for a client of mine with 3,000+ configurable products. The problem is, my client does not feel it’s robust enough (security, # products, “just a blog”).

While I am confident in the plug-in and platform personally, my argument falls flat because I cannot find a single example of a e-commerce site with 3000+ products or a marquis brand, much less configurable products, using WordPress and the WooCommerce plugin.

Are there examples I can point them to? In the absence of this, as far as they can tell they are guinea pigs to run a larger scale business this way.

I have direct personal experience with e-commerce on Magento that required massive cash to develop and had significant performance issues; but they are still associated with larger scale ecom.

http://wordpress.org/plugins/woocommerce/