If you wish to keep your Discovery channels then (like us) you will need to subscribe to the Premiun subscription on NTV:
http://www.ntv.mx/?c=2&a=0&p=6# which is €29.95 per month or cheaper for 6 months up-front, which we do. I believe you get 6 months for the price of 5.
How to set up your Mag box is here:
http://www.ntv.mx/?c=2&a=0&p=53Can't speak for the Android box, but picture quality is excellent with the Mag 250, particularly on the HQ channels, which are approaching HD.