ClockWorkSMS was super easy to setup with examples provided in a number of programming languages. We were able to use the email service to firstly check to see if users found a potential SMS service useful - which they did. After that we used the Python library and were up and running within an hour or two. The service sends automated appointment reminders for a school sports club and the low cost, the fact we could change the sender name to be meaningful to users, the fact the company is based in the UK, and the ease of getting up and running make it a great service to use.