As an computer engineer Chamilo is easy to install and has a very low RAM and CPU consumption.
As an LMS administrator, no configuration is needed to start using the platform, integration with an existing information system is easy. If needed, you can activate or modify many options to fit your teachers' needs better.
As a teacher, you need a short traning to use the platform. Tool usage is intuitive, and when you get used to them, you can start using the learning path tool to put your course into an educational sequence. In a third step, click on Advanced tool prorperties to improve your Chamilo experience. Teachers can use the platform gradually without being lost.
Students don't need training. It's really an advantage when you have several thousands of students using your platforms, with new students every years.
[warning, technical speaking here ;) ] If you are a web developper, you'll really apreciate the use of the newest develloping tehcnology in Chamilo. Chamilo uses Silex components of the PHP Symfony framework (which is, of course, open sources too)... and it is just great. This is a guarantee of security, resistance, flexibility and easier coding contribution to Chamilo.
There is nothing i dislike. May be, as for many other softwares, care if you install a very new major version, test it on some of your courses before migrating.
You are sure to make the right choice using Chamilo, beginner LMS Teachers usersand advanced ones will take advantage of the platform.
New LMS teacher users will easilly use it and will be able to improve there Chamilo experience gradually.
More experimented teachers will find the usual LMS tools, and will be able to use advanced tools and functionnalities at short notice.
The developping community is really nice and skilled. It's a great advantage for us, we can developpe or improve new functionnalities for our teachers (new quizzes, new reporting chart...), and after a strong code review, these functionnalities can be added to the official platform distribution. We can share our work with over universities, or Chamilo developpers, and vice versa.