I like that it links you into your LinkedIn profile so when someone connects with me they can see my full professional details which helps in knowing who we are talking about! It's free but if this changes then would not be happy as there isn't much benefit other than having an email address up their sleeve.
If nothing else just have an idea what people do at work and where they fit within them or maybe even get some ideas off one another too. Trying out new things by using relpro has helped us learn how to use linkedin better and also allowed myself & staff member time back again after being put under pressure due to COVID 19 situation.