Regretably, the Boox Note Max or Remarkable might be a better choice than any Fujitsu reader. I am on my second device from Fujitsu and I will not purchase another one.
Like the Sony DPT readers, the Quaderno is would be great product ... however,
1. there is no customer service in the EU/US markets. Something broke? Bin it.
2. the devices are quite fragile, with poor longevity.
3. the closed source software does not support modern systems such as Apple's M4 Macbook series.
There's also the Fujitsu Quaderno gen 3 as well - half the weight but can't do epub or mobi.