I use it for 6 years.
. - Strengths: sound, especially a reserve power for the nominal data, crumbles
not serious even at high volume, robust, quality manufacturing exeptionnelle.
- Weaknesses: None.

Compared to other amps ratings equal, it is very much in it particularly in the bass response, and the most power supply do not follow.

I do not know the price of nine, having bought used, but again in a heartbeat, I ressigne immediately with a machine of this quality!