I was very pleased with the service. They managed to find me a cancellation date a total of 4 times. All 4 cancellation slots matched the criterion I provided. The only improvement I can think of would be to keep people updated throughout the process via email; I only say this as I didn't hear from the service for over a week at a given time and so was unaware of thier progress. Also, I think the notifications on the App stating that they've found a reservation should be accompanied by some sort of sound mechanism, as you have to reply within a short time period. There was one occassion where I didn't realise they had found me a reservation until the time was up, I then had to change my test date via the official.gov website. I should mention that I was on the standard version of the service. Overall, I found this to be a brilliant service and good value for money.