First ereader for me and after 15 days of use, I have highlighted the following

Positives
* Its battery is immortal. I think I have charged it once all these days. Its usage is from moderate to intensive.
* The screen is really easy on the eyes. All these years, I have been reading ebooks from my phone and tablet. The difference is noticeable even in sunny conditions.
* The size is ideal for me. It's almost like a woman's palm. Additionally, it is extremely lightweight.
* Very nice interface to view your library. Slow, yes, but it's nice. An important detail here, due to the screen's physiology, the images are very "black." To the point that the titles of the books are not easily readable (especially the newer books that have "loaded" covers). I don't mind much, but some may be interested.

Now for the negatives
* It doesn't mention anywhere that while it accepts a memory card, it only supports up to 8GB. I had ordered a 512GB memory card, and it doesn't read it. For me, this is a huge disadvantage, as this was the main criterion for purchasing it (that it accepts a memory card).
* My entire library is on Dropbox. I thought it would have some kind of app that connects to Dropbox so I can download my book directly and read it. However, its function is different. Essentially, it has its own function, which allows you to connect to your Dropbox, but you create a new folder where you have to drag and drop the books you want there. The result is that you have a duplicate copy of the book in your Dropbox.
* The animations when changing pages are a bit "weird." They annoy me because it seems like it's glitching at that moment. However, this is personal.
* When in "Sleep" mode, you have to press the start button for a few seconds to wake it up. I thought at first that it was broken until I figured it out.

In summary: I recommend it for people who want to have their book everywhere. It's very basic and does its job exceptionally well. However, once Kindle Unlimited comes to Greece, it will definitely be replaced.