FocusTrack is already in use on a number of high-profile productions around the world, including Shakespeare in Love in London, Billy Elliot in Holland, Les Misérables, the new Phantom of the Opera 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 Beautiful, Cinderella, Once and others. 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 and Thailand.
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. FocusTrack’s grandMA2 functionality debuted with Blue Man Group in Las Vegas.
You can find a list of the shows using FocusTrack here.