I needed to post updates to both Twitter and Facebook and after trying a couple of plugins this was the number one choice. It was easy to setup (it may be worth to mention that I am a developer myself) and I really like the option to be able to re-post updates to selected networks.
Some negative things: could use a bit of cleanup in the GUI. Felt a bit ugly sometimes and things like getting back an debug array when re-posting things kinda makes it difficult for non-developer users to use the plugin (they get very confused).
But all in all: a good plugin that delivers what it promises.