Like Gano said, the Nocria is old. But from what I've seen people that have it seems to be happy with it.
The Nocria model tend to use much power when its really cold outside making it behave more like a radiator. Meaning that the COP value is very low.
I've read that the high power mode is really impressive tho'.
Personally I chose the Fujitsu LEC-N 12 because it had newer technology and better COP value.
A COP of 4,44 is not low at all considering this machine has a maximum effect of 9,1 kW
There are figures of this machine delivering over 5,4 kW when -15 degrees Celsius outside.