Outstanding. Sci-Fi looks with a performance to match. The first set I received were faulty, but Amazon's service as always was beyond reproach, and the replacements are perfect. Enough power for a large room, and no distortion until high levels. The Sub-woofer holds the power amp and all the connections, and the bass output is adjustable via a rotary control. Volume controls are mounted at the base of the R/H speaker, are touch sensitive, and work very well. To mute just touch both at the same time. The satellite units that sit at each side of your monitor are only 10" tall, but contain 4x1" transducers. The bass amplifier is 20W RMS, and the sats are 10W RMS each, so you have 40W RMS to play with, which I can assure you is plenty, especially if you have neighbours. If you have something like my kit with a Realtek HD audio manager to play with, then the clarity of highs via the HK units is exceptional. For the money these must be the best value by a long way. Unless you have £500 to throw away, don't bother looking any further. Just buy these.