My first impression was "this is the most confusing user interface ever!"
But looking past that, this is the most customizable and powerful social sharing plugin I've seen (after putting countless hours into trying about 10 other social sharing plugins for my site over the past few months).
Besides the fact that these buttons are often already buggy, I use a custom theme that doesn't seem to like social sharing popup menus so the option from WP Socializer to open the sharing link on a new page is golden.
In short, lots of customization and a huge range of services. No bugs that I've seen so far which is rare for a social sharing plugin...
Highly recommended at this time.