Let's make it clear that ebook readers are NOT tablets/smartphones. If someone expects them to have such functions, they will obviously be disappointed. The device replaces physical books, that's its function, and it does it exceptionally well.

It is the best solution for those with full bookshelves and for when you want to go away for 2 days and can't decide which book to take with you to avoid having overweight luggage on the plane. Those who read Umberto Eco, Ken Follet, and generally authors of brick-sized books, and have experienced the drama of leaving behind shoes to fit The Pillars of the Earth in the suitcase will understand and feel grateful...

Ebooks are also slightly cheaper than physical books (not as much as they should be, but let it be), so the money spent on buying the ebook reader will inevitably be saved. Most publishing houses offer books in electronic format (finally), so even if you can't completely stop buying physical books, you can definitely limit it. In terms of saving space and natural resources, it is the right move. However, it is true that books published in Greece are, in many cases (perhaps in most cases), masterpieces, with artwork covers, quality paper, and binding, and you lose that feeling of a physical book with an ebook reader.
I read books in Greek, so buying a pocketbook was the only option for me.

Regarding the screen:
The screen is very good and completely eye-friendly. You can read for hours without feeling dry or tired eyes. There is no difference from reading a book (but you're not actually reading a book - Perfect!). You can also adjust the font, size, page margins, line spacing, and layout to make the reading experience as pleasant as possible. And it is. Many times I don't even wear glasses to read, it's that easy. Additionally, the screen is equally readable in complete darkness and bright sunlight, which is great. Of course, everything can be adjusted and changed, you can have it permanently on automatic or modify it according to your convenience. The photos show the difference in the screen compared to the computer, light years apart in terms of reading experience.

File types:
Primarily EPUB and PDF for me. For protected PDFs, we first remove the password and then transfer them to the device (can be done easily and quickly with PDF editing programs or via the internet). I tried to enter the password on the ebook reader, but it didn't open. Also, the conversion of PDF to EPUB didn't work in my case because it messed up the page layout. However, PDFs play perfectly on the device and don't require conversion.

Buttons:
Very useful for reading. It has been very convenient for me to read in a horizontal layout so that I can have my thumb on the button (I'm sure I'm saving lives with this information, thank me later). Initially, you might think that the buttons are unnecessary since the screen is touch, but they are very useful. It also has various shortcuts on the screen for lighting, etc. Everything can be adjusted from the settings.

Size:
Extremely convenient, the 7 inches are just what you need and make transportation very easy. I have it with me everywhere. I was very close to buying a 6-inch one, but when I realized that my phone is 6.1 inches, I found it a bit too small for an ebook reader and I haven't regretted it. Even if it was bigger, it would still be convenient in the end.

Transfer, or how to transfer books to the new device:
Theoretically, there are various ways. I have never managed to do it with Dropbox (mea culpa for sure), but it hasn't bothered me much. Sending it via email is so easy that you don't need anything else. My routine is as follows: I buy the book from my phone, download it, and send it via email to the ebook reader. I connect the ebook reader to wifi, synchronize, and read. It's that simple.

Battery:
Charging it about once a month with daily use, don't leave the charger anywhere because by the time you recharge it, you will have forgotten where you left it (based on real events).

Build quality:
It's fine, it doesn't give the feeling of being cheap. However, since you pay for the screen in these devices and obviously want to protect it, the case is completely necessary. I got the pocketbook case, which fits perfectly and puts it in sleep mode every time it closes, which is very convenient because I can continue from where I left off.

Books:
As already mentioned, major publishers (not all unfortunately) offer books in electronic format, and because I have bought from most of them, it is an easy and quick process. Also, the National Library has a digital reading room where you can borrow books for free, and it has many titles and good books, so the savings for buying the ebook reader will come from there as well (the universe conspires).

Overall impression:
It is definitely the best purchase I have made. It supports other functions (I learned before buying it), but I haven't dealt with anything else, I don't prefer audiobooks, etc. I read, therefore I exist, and I am very satisfied with it. For gadgets, I will get an iPad.

When I got it and opened it to set it up, it was in Bulgarian. If, by chance, something similar happens to you, it is useful to know that Google Translate works through the camera and provides real-time translation.