In the case of our 2E DS10, the scores were transformative for the reasons of advocacy that Polar suggests. To be overly blunt and reductive, the school stopped treating my DS as a problem to be solved (or eliminated) and started treating him as a high-maintenance but high-value asset. To be sure, the scores are not the whole story, but when you have a problem to solve with people who take scores seriously, they are a tool.
If you have no problem to solve, I'm not sure they are worth the investment. Depends on the situation.
DeeDee