Katteb is a welcome addition to the AI writing assistant landscape. There are some pros and cons, let's highlight a few:

PROS:
The most obvious is that Katteb does a seemingly much better job at providing factually accurate content. This means more meaningful outputs with less filler content that isn't remotely useful.
Quality output. Compared to most but not all other options on the market, Katteb seems to produce a higher quality of output at least in my limited testing 4–6 runs).
Rich content. A smaller but still notable although not perfect is that Katteb not only outputs the copy for any project but also tries to pull in relevant images for the subject of each section of the write-up.
Consistency. So far upkeep, maintenance, and updates have been consistent with the platform. One of the most recent being the addition of AI Image creation which is a popular trend these days but can be quite useful in creating custom article media.

CONS:
Output length. Although the quality of the output is generally good, one big drawback here is the amount of content that Katteb outputs compared to other options. In most cases you'll get short paragraphs which means more generations and more manual updating time.
Feature maturity. Katteb offers quite a few great features, for example, Katteb Plus, Article Rewriter, and many more. The downside is that with so many tools none are getting the tender love and care they might require to be great tools vs just good. Let's take the Article Rewriter for example, the expectation and the reality of the output is far apart. The output is clearly modified, but one can clearly tell that it's the same article as the majority of the content remains unchanged. This may be due to the limited quality of Katteb's outputs in general.
Design. Care to the design of products is a big deal for me and albeit not the worse looking tool in this category out there is definitely room for improvement in both the user interface (visual) and user experience (functionality and flows).

CONCLUSION:
Overall I think Katteb is a wonderful investment for any content creators who utilize copy as a main way to communicate with their audience. It is still very much a young platform, but the potential is clearly evident and with its key differentiator being fact checking it's a definite shoe in.

I would gladly recommend Katteb as an AI writing assistant if you're in the market for one that is built for real content creation and not just gimmicks.