FISDAP is the bane of my clinical experience. Personally, I find it a very non-intuitive and frustrating data entry system for inputing my clinical data. In another life I designed data entry systems for a living, for users that did nothing but do data entry all day every day. I would have been lynched had I presented such a system to them for daily use. That being said, it might be that our program doesn't use it in the way it was designed to be used and it might work quite well for other programs. YMMV.
We took a FISDAP test at the end of our Basic class and I did find its results helpful. I liked the way it broke out how well you did in each section and it helped to know where I needed to devote more study. I think I made around an 85 on the FISDAP test and had no trouble with the NRT. In fact the NRT seemed the easiest test of any I took when compared to our Basic program and the FISDAP test.
And like another poster mentioned, I have heard that the end result, the culmination and summary of your clinical experience can be very helpful for job interviews.
So while the data entry piece sends me into agitated delirium, the system as a whole does seem to have some value.