Pros Running GrooveIP and AutoAP to call via wireless whenever possible. My phone bill has gone down to about a third what it used to be on a contract. It's my first smartphone and I am very happy with it so far.
Cons Knocked off a point for all the useless bloatware. Had to learn to root the phone and install a custom ROM to be rid of 90% of it but it runs well now.
Summary Can use free wireless calling to bypass phone / data charges. Packed with bloatware that has to be removed for best performance.