Yeah I'll follow up for those reading this in the future, seeing as how I made this post before M1 started.
Osmosis
Never bothered to give it a try. Although I do have some classmates that sing its praises.
Firecracker
Tried a free trial on multiple occasions throughout first semester of M1. The first time it was while we were still doing basic sciences. It was hard to find the material that we were covering in class (without there being too much extra info in FC to make it a time drain). Abandoned it after a few weeks.
I tried it again when we started systems (about the 12th week of our first semester), and I still didn't like it. I felt like I just didn't have enough of a background to be able to use all the information in FC. The program seems to do a decent job of tying everything together, but when you're only a semester in, you haven't been exposed to a lot of it yet. I can see it being useful once I'm closer to boards (having the text to read and questions to do), but this early in my education, I felt bogged down by a lot of the information in FC. I decided to just focus on the class material instead, using Anki along the way (which has worked out swimmingly).
Focusing on class material, using Pathoma, FA, Rapid Review Pathology, and Anki has been more than sufficient to excel first year and I'm not convinced that FC/Osmosis would have added much additional benefit.