We used WooCommerce on several sites and have been very happy with it. When we installed the latest upgrade, the inventory reporting was missing from the orders on one of the sites running it. Over 72 hours waiting for response from support is unacceptable. Site has not been working for over a week now. Time is money. Money is money. Woo has cost us both.
My hope is they get their shit together with their support. When it works, it's spot on & loaded with features. However, if eCommerce functionality 24/7 is crucial, you may look elsewhere until they work out the kinks with their support.