Reviewed and validated on: 
What do you like best about the product?
The UI is familiar and easy to navigate
What do you dislike about the product?
Trying to mimic ALL the features that exist in the desktop experience
Reviewed and validated on:
What do you like best about the product?
Availability and less maintenance, No backups required, Easily accessible from anywhere, Enhanced security features, integration feasibility, Support from Microsoft team.
What do you dislike about the product?
Nothing as such the only thing that can be improved is the migration part from On premise to O365
