Plug-in works quite smoothly.
But there are inaccuracies.
Several of them:
1. Twitter button is about 5-10 pixel higher than othe buttons.
2. There is no large icon for VKontakte.
3. When Press Like on FB button, the comment field is not visible.
I am not sure if described inaccuracies are of plug-in or my theme, but I descrbe what I have.