For XFCE users who simply want Lock Screen to work, this is perfect. xscreensaver breaks some Power Manager functionality, doesn't allow you to set zero (off) as a screen-saver time, and will even interrupt a full-screen game while using a controller. I don't care much for 'screen-savers'. We don't use CRT displays anymore and they are a waste of processor time and energy.
people keep saying xscreensaver is better than gnome-screensaver but its uglier than hell. gnome-screensaver is clean looking, and maybe it doesn't do fantastic art but it does lock my screen and have a good looking dialog. you folks with your flying toasters and cows can tell the developers to make a nicer looking (as in not Amiga 1986) password box to unlock the terminal
A standard screensaver program, with all the features you'd expect, with typical Linux customizability to boot. My only critism would be the entirely unaesthetic animations it comes with.