I have been using this for over a year now and find it to be spot on. Having just changed phones I emailed CamerAlert in the evening to change my details and the following morning it had been done. An excellent product with excellent back up.
I have tried others but this is the best. I had a recent problem when I upgraded to a new iPhone and sent an email to support. Within a very short period of time they responded and solved the problem – superb customer service. Highly recommend this app.