I use it now for almost a year with his little brother xs500. The 900 on the sub and the 500 on the tops. These amps come to replace a 3200 inter m and a 1201 mt Amcron: food being cut, my back says thank you. Impeccable connections: neutrick combo into, and Speakon output terminal. No complaints in the operation: it is still cold despite the use of several hours and performance remain the same as the hours. The advertised power is there and does well on the subs. The sound is dynamic and "collapses" them. On the negative side: The design is a little "cheap". However, for me it is good for the service ...
Having purchased the 500 and 900 for + / - 1500 euros the two new (see allemeagne specials or national), I find excellent value for money. I would do the same choice again.