Inter-M CM20.5

I bought this amp beginners 2005. I is a set with ElectroVoice Eliminator speakers and mixer Yamaha MG16/6FX (see my other review).
What about the amp, I have no comparison when judging how an amp, I am unable, all sounds good but what is the share that goes into each lments complte a sound?
The amp is solid (it is heavy trs) and trs beautiful. Unfortunately the documentation is in English (we really take for c. ..). Crying a bit, the seller sent me a photocopy of a minimal translation.
The connections are simple with several options for coupling the speakers. It seems that it is well being protected from all kinds of diverse and excs Varis.
We test the evening is not perfect and warming the sound of the fan is small and disparate rev faster in the volume gnral.
He's a friend, pro music, who advised me that mark. I am satisfied with the trs choice I recommend.
What is the difference with other brands significantly Chres? Is the Difference price is justified?
Do not hesitate to contact me for more info.