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Pros
Pro Domain authentication
It allows users to log in with their company accounts.
Pro Private and public groups
You can create private groups with limited access (invitation only) or public.
Pro Mobile apps for iPhone and Android + integration options
It offers webapp, mobile apps with "Send to" action. You can embed yammer into SharePoint or Teams, other integrations are available with Flow and RESTful API
Cons
Con Poor authoring experience
Post editor is really poor, like they don't care about the product. For example, normal posts (updates) can't be formatted, but you can paste pictures to them, Announcements are rich text enabled, but you can't paste pictures to them.
Con Not intuitive search
Search is confusing, it's hard to find replies to other people's posts if you don't type exact word present in text.
