After 1 year or so using Atlas, this is my review:
Your directory is excellent for beginner/intermediate projects, but is so-so for advanced projects.
I know the CMS is relatively new, but it's the point of view based on my experience.
Some recommendations to add/improve:
1) Style chooser on top
2) Night/day chooser on top
3) The pagination chooser in admin listings is not working well after 2rd page (at least in my versiion)
4) The operating hours in the admin, would be nice if you add a Holiday option.
5) A "keep logged-in" option in the log-in paje would be nice too.
6) A better "add image" feature, the current works well using horizontal images.
7) In the future, a basic API
That's it. Take care.