My mobile plan doesn't include any free messages, and Send SMS/SMS Mac's cost of 0.10 Euro per message is about a quarter of my service provider's normal charge, so this is good value for me.

I bought it specifically to text a friend in the Caribbean from the UK and the first three messages all 'bounced' after a couple of days. I have my widget configured so that I receive an email confirmation once the message is sent. The 'Sent' confirmation is immediate but this is of limited use, since it then took 48 hours each time to receive notification that the messages could not be delivered. This delay is out of the control of the software developers though, as it is determined by the receiver's gateway.

The developers were excellent at working through the problem and set up a special pathway for me so that on the fourth attempt I was able to successfully send messages to my friend. When successful, the 'Sent' confirmation and 'Delivered' confirmation emails are almost simultaneous.

During the troubleshooting stage, I deliberately avoided using accented characters (as found in Spanish) in my messages as well as text messages over 160 characters long (Long SMS), as some mobile providers do not permit these features. I am still at the trial-and-error phase but accented characters seem to be permitted so I'll try Long SMS next. A 160-character SMS (included spaces) is quite restrictive.

Overall, I'm very pleased with this app.