Tested one extension after another and none of the other share bars acted as they should with our responsive design. Installed this one, faced one minor issue, which turned out to be a consequence of our own Joomla modifications, and NOT! of the joomsharebar extension, but the support took care of it anyway. And that's it, the share bar is just as responsive (hi-res = vertical bar on the left, low-res = horizontal bar on top of the article) and professional as the support behind it. If you have a responsive design, then this is exactly what you need. Now I know why these guys can afford to give a 120% (yes, more than what you paid) money-back guarantee.
Thanks for this very nice review! For other viewers, please keep in mind that the features that are described in the review are only available in the PRO version, sorry for the confusion.