The platform has been easy for us as an organization, with many departments using it (IT/HR), across various locations in different countries - allowing fast communication between all parties involved when needed! I have not found anything that could be improved at this time but will say they are listening very well!! We use 5YO mostly internally within IT so haven't used them much externally yet.
They do offer support services through their partners though if you need more help than what can offered by their own team or via forums etc..