My two cents ... Concrete 5 is far superior to Drupal.
Now I have over 25 sites using C5. I had 4 drupal installations in the past and they were all converted to C5. I also made extensive use of Joomla, Expression Engine, and PyroCMS.
When I first started using C5, my clients had great advantages in terms of updating the end users on the pages. For an ordinary non-technical user, FAR is easier to update content. It was a major victory in my eyes. Most users tried to update the content with other options because it was not liquid or like WYSIWYG. C5's inline editing is outstanding.
However, it was very easy to convert HTML to templates using C5 tag commands. Therefore, in the shortest possible time, I could take a site that was static HTML or PHP and convert it into a C5 instance. Again, very simple.
Over the past 6 months or so, I would say that extensibility has increased dramatically. New modules are added to the market almost daily. Some of them are FREE, and some pay, but I think ALL of them are cheap for functionality and worth it. Most of them are $ 20 in this range.
If you know PHP well, you can easily write your modules and not pay tens, and also not worry about C5 kernel updates. There are many mechanisms that help developers use the system without having to worry about getting lost when updating the software. This was another big advantage that has cost me in the past with other CMS platforms.
In conclusion ... Concrete5 is a first-class CMS that expands widely with tons of functionality that is very simple for anyone who can use it.
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