I had the Audiolab as you know, I then had the Denafrips Ares II which I wasn't overly impressed with, but that's very subjective/personal taste.
The NJC is neutral and just gets out of the way, so to speak, but very natural sounding which I found is what I was looking for at the time. It doesn't add anything of its own that you may not have wanted. These are my findings at any rate, as always, very subjective, but I think there are other owners here who could confirm or add their own impressions.