Would be a great modern launcher if it wasn't so bloated. The bundled Python takes up 20Mb disk space, while the default Plugins take up another 30Mb. The Wox process chews off of more memory than running fully-configured Listary
combined. Adding the Everything process to that tally increases the margin substantially. And this is without indexing anything yet; just running it. Plus, it doesn't close the Everything process when exiting the program, which is slightly annoying.
So basically the only pros are the eye-candy, list of plugins and its active development. As far as performance goes, there are other programs which provide exponentially more functionality at an exponentially lower memory and disk usage toll.