I've finally tried MX Linux and I like it ...a lot!
It's polished and efficient. One of the best Xfce implementation I've ever seen. It's lightning fast on old and low spec hardware, on par with pure Debian Xfce (memory usage is less than 300MB for the 64 bit version). Has system sounds turned on and actually working (It's damn difficult, generally, turning on sounds in Xfce). It's forum seems active and friendly .
I've installed MX 16 on two Desktop PCs and one netbook. Now MX Linux it's in my top preferred distros.