I switched from MySQL to MariaDB some time ago and now I read in the news that Wikipedia is switching too. I really recommend to give MariaDB a try. Nothing is changing to you if you are running Webapps like PHPMyAdmin, Wordpress etc. You are just switching to a 100% open source software that MySQL is not anymore.
I am using Gentoo and Sabayon Linux and switching was just installing MariaDB, MySQL was automatically removed. Restarting the service "mysql" was the only thing to do afterwards. All databases were up and running whithout any configuration. Make a dump of your databases before so you could import the data when something fails with the raw datafiles. Everything worked out of the box for me and even my backup scripts are working without any changes because of 100% MySQL compatibility.
I like to replace software on my workstation that is not 100% open source. It is great that MariaDB is on its way and we could feel like we felt the good old "MySQL" days... ;)
Dear hosting providers, please switch from MySQL to MariaDB. Everything is compatible and when you are doing the first step, web application developers will follow. MySQL is great but it is not freedem like MariaDB and we all used the freedom of MySQl in the late 90's to build up our hosting stuff... It was a benefit for the MySQL project but mostly for us. So let us now do the same and give MariaDB the chance for replacement. Then the develepment of the most succesfull open database management system can go on again. Thanks for that to all developers of MariaDB!
MySQL, Rest In Peace!