So, I own T778 for about 6 months now, comming from Marantz SR7500 and even before that from an Onkyo receiver (i cant remember the model, I think it was 595). My experience with NAD T778 so far. Hmmm. If NAD wanted to make audiophile receiver, they failed totally. The fen noise is so loud, you hear it clearly in the sections of a movie, where they speak, the same also in the music, where there are quieter passages or if you listen music quietly. It is so disturbing, that I simply can not listen to it!!! Once I was napping in the living room while listening to quiet music, and the fen woke me up!
Regarding the audio quality, if you disregard the fan noise, I think that my more than 14 years old Marants beats it like crazy. I also have a feeling, that Marant is stronger and more stabile, although if you compare NAD and Marantz specifications, you wouldnt come to this conclusion. On the same speakers, the NAD simply just starts clipping at the sound leveles, where Marantz had full authority.
There is no dedicated APP (there is a bluesound app, but in it you can not set up the receiver).
What was for me the biggest atraction, was the display, but it is also a huge disapointment. First, it is showing the digital VU meters, that were for me the main atraction, only in the bluos mode, and second, it is in a not interesting grey colour. Otherwise, the screen is so big, that it could show houndreds of information, but it just doesnt. Anyways. There are many other things that I hate about this receiver, but just dont feel like writing them.
To finish. When I think about it, considering the audio quality, power of the receiver etc., and if I compare it to other receivers, I can not think that it is worth more than 1000 €. I thought I would get used to it, but am pretty much dissapotinted every time I use it. Unfortunatelly, this was a very expensive but negative experience. Stay with your Denons, Marantzs and Onkyos!