Notion replaced three separate tools for us: wiki, task tracker and CRM with one workspace. Databases with linked views are the killer feature: the same list of clients shows up as a table for me, a kanban for the team and a calendar for deadlines, and it's all one source of truth. Pages load fast. API let us pipe campaign results in from our own scripts without any hacks. Review collected by and hosted on G2.com.
Permissions are still coarse - sharing a single database view with a client without exposing the rest of the workspace takes more workarounds than it should. Offline mode is unreliable and large databases (10k+ rows) get noticeably slow to filter. Review collected by and hosted on G2.com.