It's been legal in MI on varying levels for years, recreationally now (21+) for some time.
Word is recently one of the larger growers basically undercut the market and started selling product for like 1/2 the old going rate. This has definitely hurt some small growers, but the customers see cheaper and cheaper prices. So far the quality is still decent, but now, the medical patients get the short end of the stick. Most dispensaries transitioned to recreational sales instead of just medical or doing both. And most medical product now is stuff that didn't make retail cut and was "remediated product" (which IDK what that even means, someone in the weed industry mentioned it to me and used that wording).
What's been the interesting part is localities handling it. In the capital city they seriously shut down every dispensary to "re-license" them at one point, closing upwards of 60 and only re-licensing 20 or something at the time. People were waiting around the block, medical patients included.
The city I live in now quite literally zoned off districts for weed growing and commerce. They seem to be embracing the revenue, whereas the adjacent township which could use the revenue desperately will not approve more than one dispensary.