Picture and sound quality are excellent, if the internet connection is reasonably fast (my has approximately 12Mbit / s). The app is easy to use. I have completed a one-year 2 years ago and can therefore enjoy using this app the entire site. The allocation to the account via a PIN. You can register with this app, which goes through the website of the Concert Hall, there you can therefore buy a subscription or ticket Those who do not want to can at least play a few concerts for free. How do I find a fair settlement.