The primary use case is to assist an IT team working on computers across offices, or at times a server handled by another department. If it is offsite work and we need quick access. It also helps in getting access of BYOD devices of all employees and its file sharing feature is one of the most used in a few departments although support for integration with cloud service providers is a sore point.
From a strictly remote access perspective, the experience is virtually the same between the big three remote access solutions - ShowMyPc - LogMeIn - TeamViewer. They all offer similar connection experiences. ShowMyPC has the best browser based experience - very smooth and seamless. LogMeIn's is lacking and the experience feels sluggish. TeamViewer does not offer this to my knowledge. ShowMyPC wins with the free on-demand access because it is handled via the browser. [TeamViewer] offers free - but only via a downloaded client. LogMeIn does not offer anything for free here.