I had a Dartzeel Model 1 (B) that did not have the SNCP upgrade. I now have a model 2 (bought used) connected to my VTL TL7.5 III preamp and using my Yamaha NS-2000 speakers
The difference is huge. Lows were much better, deeper, tighter and drums became much more life like. The highs have more air and separation around them.
Music on the model 2 also sounds fuller and richer at lower listening levels - My wife doesn't yell at me as much.
I'm lousy with all the descriptive sound-speak, and the Model one sounds great, but but the Model 2 is just on its own higher plane. It's not even close