I've been to both UNECOM and UHS for interviews.
I went to UNECOM first. I was impressed by their facilities: classrooms (OMM room is huge), study rooms, state of the art anatomy room (has windows for sunlight unlike others I've seen!!), gym, and beautiful campus scenery with the ocean nearby. The students and faculty were very friendly. The school has many affiliations with Northeast hospitals: NY, NJ, and MA especially, a plus for me since I want to stay on the East Coast (I'm from NYC). They have a program where you could work in underserved areas in Maine, lots of clinical exposure there.
Another plus, approx: 120 students in a class.
The bad: This is not a diverse school nor is the area. If that doesn't bother you then it's a good fit. There is basically nothing outside the immediate area. The campus is isolated from nearby stores/restaurants so you definitely need a car. The nearest major city is Portland which I didn't have time to check out but is the place where many students live. Out of all the schools I visited, I had the worst interview experience here, not in terms of the actual interview, but the organization wasn't great. We all met in the hall since the room they thought was reserved for us interviewees was not. They started the welcome speeches 15 minutes after the appointed time. It wasn't run very well in general. Their library left something to be desired, very small.
UHS: I really liked the school. The facilities are top-notch: huge classrooms, comfy study rooms, a new building solely for research was being constructed, nice gym, and easily accessible campus from apartment complex across the street (Century Towers).
The students were very relaxed and friendly as were the faculty. They really give you a sense that they want you right down to the fitting of white coats.. on interview day! But their interview day was the best out of all the schools I've been to. They showed us a video of the school, provided lots of brochures and forms, gave an excellent OMM demonstration by a DO professor, and an informative lunch with students. The rotation sites and residency positions were spread out throughout the US. Although most of them were in the central US, there were a good number in NY, NJ, and PA so I don't mind at all. The cost of living is cheap...Century Towers across the street is only about $500 for a 1br. I wish I had time to check out the apartments outside the area. Car is most likely a necessity here.
Bad: The outside of the campus is not so welcoming. Basically, don't walk around the area at night. Century Towers elevators aren't very dependable. The class is a bit large for my tastes...approx. 250. There's nothing else about UHS I didn't like. The plane ride home to NYC...I don't like flying.
Anyway, I hope that helps...
Oh, and I will going to UHS in the fall.