After trying some of the Ai writing assistant tools one thing is clear. Your input to the tool matters.
I have mostly used the blog and writing related tools so my review will be based more on it.

What to not expect:
1. Don't expect this tool to write you a subject matter perfect article. Only you can do that.
2. This tool might not be on the spot every time. Yes functionally non useful output still exists.

What to expect:
1. This tool will help you a lot with breaking those bars of productivity blocks.
2. Very good for coming up with new idea or a focus sub-topic into your niche.
3. Think of this tools as if not your gym trainer but that unique fitness app. That might guide you to be more consistent and hence more productive in your content creation workflows.
4. Nice and simple to use UI. (room for improvement, still great)

I'm personally using it to be "my robot helper" in the written content creation workflow.