I attended it last year and got an acceptance email about 3-4 days after the end of interviews. My roommate who also got accepted was notified the first week of April.
I applied to five PhD programs last year, including 1 ivy. All of these school strongly recommended taking a GRE subject test. My undergrad degree was in a completely different field and yet I was accepted by all five schools without ever taking GRE subject test. So my advice is to the score only if you did exceptionally well (>90 percentile)