There are certain serious issues about using third party software to implement some type of an edge. If you are a chartist NT is fine. But if you are backtesting or implementing algorithmic trading things are a lot different. Programs like NT, TS, MT and other ones can easily transfer proprietary information from its author to their author. Now, some would argue that they need not do it since most traders lose money, blah, blah, blah. Yet, the fact is they can do it. No man who is sane should use them then unless these companies come out public and release specific and detailed binding statements that they are not engaged is such activity.