Have so far einben TF 7700 HDPVR had. The switching times and the extra things like Hbttv and integrate a surveillance camera were not or with long response times can only be operated. The Duo² can do everything super fast. The only complaint is the remote control can not control the sound through a sound system. What should I do with a simultaneous operation of the TV? That's so unnecessary, but without sound in DD is the remote control not be used. Must acquire an additional Hamony. Thus, the price goes up again.