The NS10 was a bookshelf speaker for home stereos that skyrocketed to popularity because it turned out Bob Clearmountain was using them as a reference on tons of hits he had been mixing. The Radio Shack Minimus 7, Apple desktop computer speakers and others have been thrust into a magic box status by many who hope that they will hear what those mixers are hearing and improve their mix results as well.
The real deal is that a speaker must make sense to you and it must make you work in a way that is productive and translates well.
I have to say, I'm with you...the Twins are still amazing me with the speed at which I can work and the fact that I don't really have to check them on multiple systems anymore. My brain digs them and interacts with them well.
I never liked the NS10, but I have dug things like the Alesis Monitor Ones (original grey ones, passive) and even the Mackie HR824 for a time...and once I learned them I was able to do decent things as well. Not as fast and as accurate as the Twins, but certainly decent.
I dunno, NS10 suck in my opinion but they work for a lot of people. I don't consider them revealing in any particularly good way that I need them to be I suppose.
Congrats on realizing the Twins are rocking hard for you, I have never advocated jumping around on monitors as we're all better off picking a speaker and learning it and sticking with it. I sure am glad thus far to have settled on the Twins...