I am sure that Turbo Tax is a good program. Same for Tax Cut (or whatever they are calling it now). BUT...
Garbage in - Garbage out!
Just because you can get the program to do what you want it to does not mean it is right. I am hearing reports that the IRS is looking at self-prepared returns where commercial software has been used. It is catching honest mistakes but they are also finding examples of people manipulating their answers to the software's questions to get the result they want. If you answer a series of questions and the answer is no, chances are you didn't get it wrong. The answer is no.
If you run into problems, grab a IRS Publication 17 and look it up. You can download at the IRS web site.