Hey paswonky,
I applied to the HSI program and got accepted a couple of weeks ago. I accepted their invitation to join the program. I had a lot of the same concerns you did during the app process. I was worried about whether this program was really worth it, for just one year, and whether it would significantly improve my med school application. After having my interview with Dr. Tan, the program coordinator, I felt much better about applying/attending this program based on my particular situation. You said it yourself, she also coordinates the JHU premedical program, which is well renowned and helps a lot of students get into med school. So she must know what she's doing and it definitely seems like she has her student's best interests.
I did my undergrad at UMBC with a BS in Biology. My cumulative GPA was 3.6 and my science was 3.5. So my gpa was ok, but it was not up to the level of a 3.7, 3.8 and above. I took the MCAT in January and got a 27 (PS:11; BS:10; VR: 6), without taking a prep course. And I really don't have too many extracurriculars. I worked for one summer at a neurology clinic. Since I graduated last May, I've been volunteering at my local hospital, garnering 350 hours so far. And I was in a few clubs at college, where I would participate in different events every now and then.
So to summarize my grades are ok (but not up to par, at least for MD schools), I did poor on my MCAT, I have limited clinical experiences and no research experience. And I did not hold any leadership positions at college. So after considering all this and speaking with my premed adviser and others, I decided to apply to some post-bacc programs, specifically one year masters programs because I did well in most of my pre-med requirements, with a few exceptions.
While looking through the HSI website, there were many aspects of the program I liked, compared to the SMP program at Gtown or the master's program at Michigan. First, was the courses being offered in the HSI program. I mentioned before that I did alright when it comes to my premed requirements so I definitely did not want to retake premed classes all over again for the next year or so. The HSI program is offering high level science courses such as biochem, cell, and other higher level electives. I have already taken biochem and cell at UMBC, and earned As in both. Of course, since this is JHU and a master's program, I definitely think the courses will go into more detail and be more challenging and rigorous compared to the undergrad courses. Dr. Tan also told me that master's gpa tends to carry more weight than your undergrad gpa if you do well in the program. So I saw this as a great opportunity to improve my gpa and reinforce my pre-existing knowledge in these subjects.
Also, the HSI program is going to provide an MCAT prep course. I did not do as well as I was expecting on my MCAT, specifically with that horrible verbal score. So hopefully the prep course will provide me with different strategies and tactics so I can do better on the retake. This was another plus for me.
Also, when I had my interview with Dr. Tan, she mentioned the different affiliations the program has with various hospitals, research companies/labs, government agencies and doctors. Through these affiliations, there are a plethora of opportunities to engage in research, get a job in industry, or engage in shadowing or volunteer activities in the community. This was a huge plus as well because I potentially have numerous opportunities to get involved and gain experience in different areas of medicine.
Plus, the program is going to help students throughout the med school app process via interview workshops, personal statement workshops, advising sessions, and etc, something the other post-bacc programs don't offer.
So for my particular situation, I thought this program was the perfect match to help improve my weak areas, reinforce my strengths, and ultimately prepare me to become a competitive and successful med school applicant by next year. All I can say is it all depends on your situation. If you're only looking to greatly improve your gpa, you may be better off applying to a postbacc premedical program. If you're only looking to improve your MCAT, you may be better off just signing up for a prep course with Kaplan or PR, instead spending $35,000 on tuition. If you're only looking to gain new experiences, then you'll probably be successful finding these opportunities on your own. But if you're looking to improve in all these areas, then this is most likely the program for you!
So I hope I was able to be of some help for you. Sorry I went overboard with my post lol. It's just that I was also looking for other people's opinion on this program, but I couldn't find a damn thing. Then I came across your post and you were in the same boat as me. So I just wanted to provide some of my insight about the program for you.
Good luck with your decision! If there's anything else, just let me know.