I like that it's easy enough so we can share schedules with our team members or communicate them when they're away from home/office without having someone else look after this process (or just forget) while you are out! We've even used it as an internal "virtual office" during times off-site - which has been really helpful too given how hard these remote working days have become lately.
It could be improved by allowing more granular control over who gets access what schedule at different levels within your organisation if there were some way around creating multiple accounts etc but otherwise great product overall!! The ease of use makes me feel happy about using sling rather than other tools available elsewhere. Having one place washes up my back end tasks nicely since i'm not always sure whether people need something sent straightaway via email vs text message.