Do not spend any money on this!
Could be a nice app, but the “user support” is a real nightmare. One of the last updates messed up the app completely: audio output of the device will be muted as soon as you start this app. Only a restart of the device will bring audio output back. I have contacted the support and asked them to fix this. They didn’t even bother to apologize and told me straight away that they will not fix it for some (obviously made up) reasons. End of discussion. This is the most rude and unprofessional “support” I have ever encountered. Note that they still claim support for iOS7 even though they know that this is not true...