I was perfectly happy with this plugin until it got updated to version 3. Before, it was just working in the background, announcing my new posts on Twitter. Now it handed this duty over to the Social Plugin by the same Author and only has options to show my tweets in the admin screen, create (another) link for the tweet and show its credits.
Social, on the other hand, replaces the default commenting system with its own, without asking (at least you can disable it) and annoys by showing another screen to "broadcast" your post to Twitter and/or Facebook when you publish it, forcing you to do a couple more clicks to do what used to be only one click with the old Twitter Tools.
You lost one very happy user.