I ordered two HPA-NXV300s to replace the output-stage in my old LC audio (DIY) amplifier.
I use a Yamaha surround receiver as pre-amp, and the nxV300 drives two Dali Lector 8 speakers. The sound is extremely clear and the bass is in perfect balance to the rest of the sound picture. Even though there is no problem driving your next-door neighbor crazy with this amplifier.
The build quality is really good, and mounting the modules was easy. The installation manual is easy to understand, and it also gives a suggestion on how to wire your own power supply.