Bookwyrm imported my goodreads export more or less fine, but (IDK if Amazon gave me them) my lists disappeared in the process, and trying to recreate them was the dealbreaker for me. My absurdly large book lists were casual and not something I needed to keep, but I have a few 50-100 book lists that I do care about and that would have required manually searching each title, and that's where I drew the line.
It's already enough of a hassle to go page by page through the 1000-1500 books I have on goodreads and check boxes. Typing them out is way too much work to migrate.
Eventually I'll probably roll my own because I have other functionality requests none of the options meet, but goodreads lists are already not great, so not even matching them is a big step down.