My own experience with the Infinity Primus HCS, has been extremely really good, and in terms of home cinema quality, a major concern when buying these types of speakers, they come with a 5.1 channel amplifier making these speakers quite powerful and very responsive. Whether it be watching movies with loud sounds such as explosions or very low sounds that other normal equipment may make inaudiable, they speaking bring any film to life, just as if you were in the cinema itself. One thing I would also note is that when you are listening to music of any genre, the sound is very controlled and deep, not distorted what so ever.
With regard to materials the sound system is made of, all I can say is just take a good look at the sound system. It wont take you long to realise that the overall look screams volumes as to the effect it will have on your audio experience. Finished in quality wood, helping greatly to make the sound as stable as possible due to the small air vent "reflex" of each speaker in addition to the good rubber suspension that has the look and feel of Titanium makes watching movies, not only sounds effects but also dialogue and great experience for the entire family.
Ultimately if you want a high quality sound system for your home, then do not hesitate to invest in this brand as in my opinion and from experience I can say it's well worth spending money on the Infinity Primus HCS.
It is advertised as a leader in the market, and you really cant argue with that.