I am writing my statement of purpose and wanted to know if the phrase stunning insight in the sentence"...gave me a stunning insight into the use of X in a variety of applications." is formal or informal i.e. can be used in a statement of purpose.
I suppose it depends on the tone of the statement in general and the larger context. "Stunning" is more of an emotional word and a lot of academic writing tends to avoid references to emotion, in my experience.