For the rated power it's a very, very small amp....
So I am driving it hard at this very moment, pushing it to it's [bridged]limits.
First things I noticed while first listening to it, are the amazing detail and placing of instruments in mid-air, speaker-placing is hard to detect with my eyes closed.
It playes with much more detail than the ms2250, which is powering the peerless xxls12 sub at this moment in bridged mode. [thanks Cecil].
There's unbelievable punch and detail coming from this small helix amp.
IMO; a GREAT [!] amp for SQ, don't try to drive some subs all day long with it ,because of the small heatsink.
There are 11 [!] diagnostic leds on the board, who light up when all is well.. romance !

It has no heat problems in my setup, but my towers are 6 ohms, so the amp doesn't have to work so hard, and the low-pass signal goes into the 2250.
These amps are common found around here as used amps, as they are made in Germany, our neighbours.
There's a whole range of this series, all well designed and with very promising specs.
www.audiotec-fischer.com [in German..]