I love eink devices but got turned off by the first couple of generations because they always underdelivered with PDF display, which seemed like a central use case to me. I should be able to open a random graphics-heavy PDF and have it display perfectly (ignoring color) and in a reasonable amount of time for an eink device to be worth it to me.

This has made me want to revisit them but I don't think I'd want to purchase one without being able to stress test in person.