I like how easy it is to use, very intuitive for new users as well! It's also good we have access from everywhere in our organization so there are no extra steps of having multiple terminals open at once or needing help setting up your computer/mobile devices etc..
The only thing about demand commander i dislike was not being able to do more than one task per screen session (i think this has been fixed now but haven't used since then). This helps us manage all aspects of procurement including vendor selection, contract negotiation & execution, RFQ creation / qualification process flow through PO line along with reporting capabilities such as PPMs, RFI responses, NDA status tracking among other things - without using too many different tools which could get confusing when trying to keep track of everything going forward.