Let's start with the price: no, it is not expensive. New, 5500 euros for 4 channels, it's only 2750 for 2 channels. The top at that price, you can not do better.

As for the amp, nothing to say. The 4 x 2000W into 4 ohms are there, but it is clear that applied at the bottom (the clip) and 4 subs, the headroom will be limited (to an outlet 16A, no miracles). However, the power is there. 2 db less and it breathes well.
Tested on four heads and two subs, nothing to report. Power well respected and dynamic present.

Quality of their faultless.