[Jmirko]

I have researched this subject to some extent. Here is a brief summary of what I know:

Hardware:
- There is nothing wrong with e-ink for note-taking, the screen refreshes only at page turns, similar to reading.
- Monochrome LCD also works, but it has less contrast, so you need good lighting.
- I don't like taking notes on backlit color tablets, because the light hurts my eyes.
- For accurate and comfortable handwriting, the device should have an "active digitiser" in the screen (Wacom or similar). This allows the screen to ignore your hand and avoid unwanted marks. The small Sony devices (T1, T2, T3) don't have this technology so I would not recommend them.
- Screen size: ranges from 5 to 10 inches, should be an important factor in your choice. I prefer 8-10 inch devices.
- Sound recording: if you want to use the tablet for meetings or lectures, sound recording can be useful.
- Camera: if the device has a built-in camera, you can snap a photo of the whiteboard or a document and embed it in your notes.

Software: depending on what you want to do and how frequently, some devices will fit you better than others. For example, my workflow involves writing, erasing, inserting and deleting pages, saving notes, renaming notes, searching notes by key words in the title, sorting notes, editing notes after saving, making backup copies, and converting notes to pdf when I migrate to a new device. Not all devices support all of these functions.

Here is a summary of the devices I have used and my experience:
- Asus EeeNote EA800: 8-inch screen, unfortunately monochrome LCD, not e-ink - otherwise the best device I have used so far. Excellent hardware (rugged aluminium frame, sound recording, camera, responsive and accurate stylus) and software (fully supports the workflow above, plus undo, copy-paste, custom templates, etc.). Highly recommended for note-taking if you work in a well-lit environment - otherwise go for an e-ink device. Not great for reading due to the screen. Not sold by Asus anymore, sometimes avalable on Ebay as new or used, 100-150 USD
- Onyx Boox X60: 6-inch e-ink. Good for reading (supports most formats, has good zoom/font functions). Only o.k. for handwriting as software is not optimised for my workflow - too many taps required to do what I want. It's drop-proof so a good choice for a child as a first reader. 50-100 USD
- Onyx Boox M92: 10-inch e-ink, excellent for reading, even better than its smaller brother (e.g. supports multitasking). You can even run Linux on it (Obuntu)... Only o.k. for handwriting as software is not optimised for my workflow - too many taps required to do what I want - but usable. Available new or used, 200-300 USD.
- Irex Iliad: a very old device, but quite capable for both reading and writing. It uses a real Wacom digitiser so is more accurate and pleasant than Onyx or Hanvon (which use a slightly different technology). Its 8-inch screen is a good compromise between visibility and portability. One disadvantage is the proprietary charger - if you break or lose it, you can't use an USB charger instead. Only available used, 100-250 USD.
- Irex DR800: the successor to the Iliad, with great hardware and software. It's small and light, and has an 8-inch e-ink screen. My only gripe is that the stylus is not as accurate as the Iliad's, especially on the top part of the screen. Used only, 150-250 USD.
- Irex DR1000S: very large reader with a 10-inch e-ink screen. Excellent for reading as well as writing, although the screen is not as white as the M92. Discontinued, so only available used, 200-300 USD.
- Hanvon WiseReader N800: 8-inch e-ink. reader with very good hardware and software, but almost impossible to find (I bought mine on AliExpress, but it seems to be gone now). Originally 400 USD.

I have not owned the following, but they may come up on your radar:

- Pocketbook 903/912: uses the same stylus as Onyx and Hanvon but as far as I know it's not possible to take notes on it - if somebody knows otherwise, please let me know.
- Hanvon WiseReader E920: seems to be a very capable 10-inch e-ink device, not sold directly but you can buy it new on Ebay or AliExpress.
- Sony DPT-S1 (mentioned above as "Mobius"): not tried it, probably great for writing, but supports pdf documents only. Also the price is very high.
- Several other, smaller Hanvon ereaders support handwriting, these are available via Amazon or Ebay.

I hope you find this useful. Let me know if you need more information. You can also check out the Flea Market for such devices currently on sale.