NOS just has a bad reputation because it is cheaper then a more permanent boost more people who don't have the money up front use it (insert V-tech comment here). Being that it is low cost often people cheap out on it because they didn't have the money. And cheaping out on any upgrade leads to sever problems down the road.
The best thing anyone can do is buy or check out a book from those places know as libraries and read. It can be an old book too, the technology has been around along time.
http://www.amazon.com/Engine-Management-Advanced-Greg-Banish/dp/1932494421/ref=sr_1_2?s=books&ie=UTF8&qid=1349112293&sr=1-2&keywords=forced+induction"]Example[/URL]
These books have more knowledge then any one or 100 threads can ever give you. And will save you alot of time, pain, and money.
But if you just want a cheap not useful answer that doesn't take any effort please keep asking these questions. Here's mine, NOS is find you should do it, it is simple and effective.
