The Model 4 is a gem of an amplifier, but its quality depends on your willingness to accept an amplifier limited to 50 watts per channel, albeit with a continuous maximum current capability of 16 amperes and a peak current capability of 50 amps.
The other technical specifications of the Forte Model 4, incidentally, are relatively conventional. Input impedance is 47 kilohms, and bandwidth is 3 Hz to 100 kHz between -3 dB points. As is usually the case with modern transistor power amplifiers, distortion is vanishingly small. The damping factor, however, is a comparatively high 400, and output noise is less than 300 μV, which is better than many amps in this price range.