I like all of it, but especially how easy is for me as an admin user can quickly add new products into my store without having anyone else's help or approval! It also has great reporting features that lets you know exactly where your sales are coming from (or not).
There have been times when we've had issues in our server/website causing this software glitchy at best which makes things difficult if they're down during peak hours etc.. We use convertcart primarily so people don't need access keys anymore - just logins via social media accounts such facebook & google sign-in would be nice too though!! If someone could make sure there was something added about allowing login through other means than using Facebook / Google Sign In then i'd definitely consider purchasing again otherwise its good enought until next time :).