I have owned NAD Home Theatre Receive (T-765) and an integrated amp (C 375 BEE).
- I upgraded from a Yamaha home theatre receiver and thought they were outstanding.
- The NAD home theatre receiver was specifically requested (with incremental cost) from the buyer of my house. I owned it from '08 to '18 and it performed as expected.
- The integrated amp I bought in '15 and upgraded in '20. I don't know if it was ever off in those 5 years.
My experience is they are made like tanks. I haven't heard their master series stuff. I have owned a Bluesound and thinks it's a great value.
In general my advice is to listen to as much as you can and if you like it - go for it.