FocusTrack is already in use on a number of high-profile productions around the world, including Billy Elliot in London and Les Misérables and We Will Rock You on tour around the UK; it made its Broadway debut on The Woman in White and is currently in use there on Mary Poppins and Billy Elliot. Rep companies such as English National Opera and the National Theatre are discovering its benefits, and it is in use as far afield as Macau with Cirque du Soleil.
Young Frankenstein in New York was the first show to use FocusTrack with ETC's Eos console, and the British tour of Mary Poppins the first to use it with a grandMA.
You can find a list of the shows using FocusTrack here.