Step prep was largely hands off - there was a peer-to-peer program run by the school to connect 3rd/4th years with second years throughout 2nd year to hit on high yield topics for STEP 1 - it was a small group session (think 2-3 upperclassmen to 4 underclassmen). They also go easy on the last block of 2nd year and allow 2-3(?) weeks off during that summer for dedicated. You can also take a total of 3 months of vacation in one-month blocks split between your third and fourth years. Some people used 1 month of their vacation time to take off for studying for STEP 1 but it's not entirely needed unless you're behind on prep (e.g. you barely did any studying before dedicated hits). As far as how prepared the lectures themselves will make you feel - moderately helpful, but probably on par with most other medical schools? You will definitely have some lectures that are not going to even come close to any high yield topics. As long as you learn Anki early on and start using UFAPS during second year, most people will do very well.
I was in APAMSA (Asian Pacific Medical Student Association), did the summer research program, and did a few shifts at the free clinic downtown (which I think 99% of people do as well). I was also in the research pathway which is more of a class than a program.
Best parts - Collegiality among the class. Everyone seems to want to help each other out with learning even though it's still graded and not pass/fail. The location is pretty nice - you're close enough to Chicago and downtown Milwaukee while still having a little more suburb-feel around the medical campus. Rent is cheaper compared to big cities as well - I payed a hair under $400/mo throughout school living 2 miles away. If you want to rent a room in a house within 0.5 miles of the school, you might pay 600-800 + utilities for one bedroom of a 2 bed / 1 bath shared with a classmate. There are also a little more bougie apartments in Wauwatosa within 1-2 miles if you want to pay 1200-1500/mo. The peer to peer tutoring from 1st year basic science/phys and 2nd year pathology was pretty nice and I definitely utilized it. Ample exposure to most all specialties if you want to explore a competitive field.
Worst parts - The free on-campus gym is terrible and not well maintained. It seems like such a small thing, but if you are into fitness/working out at all you have to spend $50+/mo to workout at the gym across the street - an expense that builds up if you're already cash strapped and living off of loans. Adding to that, tuition is pretty expensive and the quality is perhaps a little better than UW-Madison which is MUCH less for an in-state student. I would say it's not a great value if you're in-state compared to UW. Student support for the match is mediocre, and I know about 10 of our ~190 student class had to SOAP - including me who applied to a below average specialty with a 235-245 STEP 1 score range. There isn't really the big names or reputation at MCW to help you get into the higher-tier residency programs without extremely good stats. Now I will point out that 180/190 match rate is like 95% success which is good, but it really sucks being in part of the 5% that did not match.
Hope this helps, and feel free to ask any follow-up questions or anything else about the school!