I wouldn't take the opinion of a Zaino fanatic as fact lol, they can be somewhat biased. Zaino users fine, but "fanatics" IMO never give anything but what they're fanatical about a fair shot.
Its definately a different kind of shine than Zaino, its deeper and not as "plasticky" but it doesn't look like carnuaba. Kinda weird, good weird but weird.
Seems slicker than Zaino to me, about 3/4 as reflective and twice as deep.
Like bret and others have said though time will tell, mine is 3 weeks now and looks as good as the day after I applied it. My guess is you're not going to get Zaino durability out of it though.
As for filling check out my response in the "How well does NXT fill?" thread in the Product Discussion section.