I'm a successful early decision applicant and here are my 2 cents after going through this process. Sorry for the novel but I found the EDP advice on SDN to not be very helpful when I was struggling with the idea of applying EDP. Every school is going to have different policies on how they run their EDP so be wary of posters on SDN making blanket statements which just add confusion and unnecessary anxiety in people considering EDP. Call the schools you are interested in and ask about the program. For me, the main admissions office for the school I was interested in wasn't helpful at all. They told me this wasn't undergrad admissions where they provided counseling to applicants

. I then called the number listed for the admissions director, the secretary scheduled an appointment for a telephone meeting with the admin director, and then I later received very helpful feedback on if I was competitive for EDP and how their EDP program works. It might take some extra work but really try all of your options into getting a meeting with someone who knows what they are talking about to discuss your file.
Some of the questions I asked were:
Did they only accept a fixed amount of EDP applicants? Answer: No. (This was the most important question for me because the MSAR showed <5 people matriculating from the EDP program. It was a great relief to know I wasn't competing for just 1 or 2 spots).
How many applicants apply to EDP? Answer: Couldnt give out that information (but definitely ask this because it cant hurt).
Do they only consider extremely competitive applicants (i.e. high gpa/mcat, great experiences)? Answer: No. If I was competitive for the normal admissions then I would be competitive for EDP.
Does applying EDP affect my chances in getting accepted either positively or negatively? Answer: Not really. It's not a backdoor to getting an acceptance.
Am I competitive for EDP then? Short answer was yes and received some broad feedback about my application. I could have (and did) look at the MSAR to decide if I was competitive (I felt I was), but admins look through thousands of applications and have a good idea on what they are exactly looking for. So even though I didnt receive any ground breaking feedback on my file, I felt confident Id at least get offered an interview based on talking with the admin. Once you get the interview, the rest is up to you to seal the deal.
A question I should have asked but forgot is if I applied EDP and wasnt chosen for an interview, would they notify me right away and release me from EDP or would I have to wait until October 1st?
Like I said earlier, each schools EDP program is going to be different so you need to ask. I only shared these answers because it contradicted a lot of the general comments by uninformed posters on SDN (not this thread specifically but other SDN threads). Some other thoughts:
There is a lot of talk about applying late on October 1st if you arent accepted EDP. I submitted my primary in the middle of July (which was verified in 11 minutes), and I had been accepted last week on about the exact same day that AMCAS had finally gotten around to verifying applications on my primary submission date. Thats an interesting thought. For me, EDP was worth the risk of having to wait an extra week and a half to apply to other schools if I didn't get in through EDP. While it isnt ideal to apply to schools on Oct 1st if EDP doesn't work out, its not a deal breaker if you are working on secondary answers while waiting for an EDP decision.
I am not a super competitive applicant. I was competitive, well rounded, and had a good reason to applying to that one specific school. Maybe some schools only take the superstars but you need to get that from the horses mouth before writing yourself off for EDP.
There are a lot of comments that if you are competitive enough to get accepted into EDP then you are competitive enough to get accepted in the normal admissions program. Yeah
.but sometimes applicants fall through the cracks when there are 10,000+ applications to screen. EDP cuts through some of this risk.
I hope this is helpful and best of luck to anyone applying EDP.