Very good and cheap for the power it delivers at €150. For those who say that TRF amps overheat, this one here, because it is class D, does not get hot with the gain at 70%-80%, tested!! It also doesn't draw much current. Now I'm running 2 8-inch speakers and 2 horns along with a 12-inch subwoofer in bridge mode and it doesn't even flinch!! In terms of size, it is very small compared to an AB of the same wattage. It has full adjustment of LPF and HPF along with Bass Boost on each channel. It also works at 2 ohms on each channel unless you're running in bridge mode, which is only at 4 ohms. As for sound quality, with a prehistoric Pioneer source, even at very high volumes, it doesn't distort.