A few years ago we started using Magento for our customers that wanted websites on eCommerce. Magento is a pretty complete platform, has integrated pretty much everything you need, just like Wordpress but way more complex in my opinion.
You also have the possibility of adding "extensions" just like Wordpress plugins.
From an SEO perspective, it is pretty great and but it lacks in good free extensions.
What is your opinion about Magento and what similar platform eCommerce would you recommend?