I like this, and it looks beautiful on my site. I also suggested some improvements that they'll be looking at. Test it out on a smartphone and experiment to see if there are user experience issues. A G+ button would be great, and I'm sure that's coming. Also, options for placing your smart layers would be nice. On both desktop and mobile, I'd love to be able to put these buttons below a post and below the video in a post instead of on the left side. That's what regular Addthis buttons are for I guess. What I've heard is that site users get a customized view based on sites they regularly share on, and that's quite a good feature. Try it out. It seems to put less load on the site than normal buttons.