I am implementing it as our CMS. This summer, I transitioned our entire athletics site (1500 pages and counting) from Frontpage to MODx, and we have 15% of our academic sites in it so far. I make up the university's entire web department and it has made my job a lot easier. I also use it for my freelance clients who want to maintain their own web sites.
- Open source
- framework system so I can overwrite core functionality without hacking core code
- very involved developer community
- page look is controlled through a template system. You can code the templates any way you wish and then just replace content areas with MODx tags so it can pull it into the content editor.
- easy to upgrade
- We have administrative assistants maintaining sites, and it is easy for them to use.
- can set up users with the ability to use the backend manager or front end site to make edits
- I'm not a programmer so I rely on resources and features others have created.
- No versioning or rollback ability yet. It is supposed to be a feature for the 1.0 release.
- somewhat nervous about getting into high page count. I think 5000 pages is the safe maximum. The next release should be able to handle more.
- no ability yet for approvals before pages are published.
- backend manager uses frames and doesn't fully meet accessibility guidelines. The next release is slated to be fully compliant as they are overhauling the entire codebase.
- handling meta tags and descriptions can be somewhat of a pain - you pick and choose from a list and can't create them on the fly.
There are a few other cons that I'm just not thinking of. But having 0 budget for a CMS, this system has been great. Some of the cons are being addressed in the next release. The alpha release is out now and they want to release the beta and stable version very soon.
One system that is out now that I would have liked to evaluate at the time is SilverStripe. It is a framework system like MODx and appears to have a few more features.
I'd be happy to answer any other questions you may have.
I've used in separate work and love it. I'm not sure I would throw a lot of pages at it though, as I'm not sure how tuned the database is for lots of requests. Anything that is a sub-1.0 release makes me nervous for something high profile as well.
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