The Naim Superuniti streamer, which I bought about 10 years ago, was by far the worst and most expensive "hi-fi" device I've ever owned:
• the first unit had a very noisy toroidal transformer. Replaced under warranty with a less noisy one, but still audible at low volume;
• the second unit, due to particular settings of the green "naim" light on the front, went by itself in mute every moment. They pretended to repair it under warranty but only changed the above setting;
• the wi-fi was not usable and I was forced to pair it with an Apple Airport unit;
• they promised an upgrade that would give compatibility with AirPlay, but never provided it;
• the firmware update procedure was extremely cumbersome;
• the green screen (oled) after a few years became invisible. This happened to all owners of the device and other models with the same type of display, but despite this, the company demanded around € 400 for the repair (I refused to repair it);
• finally, the remote control has also broken;
The first criterion I used when choosing a new streamer last year was "stay away from Naim".