We use Zendesk as our customer support Hub. It is used by our customer support team and it helps us address customer needs in a timely manner. We can engage with our customer from any point in the buyer journey as well as with post-purchase support needs. We love Zendesk!
Zendesk works really well for eCommerce. When talking with potential customers or actual customers, Zendesk lets us address their needs quickly and effectively. I have also used it for hardware products and it is amazing for creating installation guides and resources for use-case examples etc. for customers.