I use the amp in conjunction with 2 Heco Victa 200 and am pleasantly surprised. In direct comparison to "real" amps of course notice that regulator for treble and bass are not available. As a prerequisite for the amplifier I would definitely recommend a higher quality sound card.
The sound is balanced and has the right amount of bass (noticeable but not excessive), that is of course a matter of taste.
Background noise is a very low presence that exists only in a very limited extent, but is also determined depending on the quality of the power supply used.
Basically, I would say that the amplifier can be fired even larger speakers (has my Magnat Quantum 603 easily pushed up), but I think it only makes limited sense then to operate> 200 speakers with an amplifier 40 :)
All in all highly recommended.