The most positive thing about Ni is foresight. Either short term or long term. This is very very helpful in life.
And also approximation. Weighing what's right and wrong and the percentages for each choice and going with the most probable one. Ni users are pros in that department. This is the reason I ace all multiple choice tests, sometimes without touching my book. I use Ni for weighing my options and deciding which one is the most probable and it rarely lets me down.