I first started using this widget when location I was in, had poor cell signal. From my Mac desktop, I could send quick SMS to others. It has an excellent Addressbook integration. It sends email replies about success and failure. I got a macbook and installed it on it and abandoned the desktop. Allow for replies to one's email address for recipients who are able to do so. I like the fact that I can SMS people when I am traveling internationally without paying for exorbitant roaming charges. The owner/author is very responsive to issues when some international SMS fails. This is not a free app. There is an annual fees and also per message charges. The only Cons I have is my addressbook numbers are inconsistent, One has have a habit of putting numbers in + format. While it is feature rich, I would like to see two wishlists: I have many work related SMS messages that have predictable texts such as "Done check email" or "I am running late" I would like it to read canned responses. Second is, MMS. Would like it to send pictures.