[ProDigit]

The best...
Depends on which Astak reader.
I have the EzReader Pro, 5".
Like all readers, they contain largely of the same hardware as similar E-ink devices released around that time.

I can tell you some good things, that many devices don't have:

- It is by far the lightest e-ink device I've ever held, yet in no way does it feel like a cheap toy!
- It's rigid just like most other readers, but at a fraction of the weight.
- it has the page flip buttons on the right place (where you hold the device),
- it has a flip switch, kind of like the Iliad's flip bar, but the size of a switch, which makes me want to use it even more!
- A very good OS, so far I haven't had it freeze even once on me (except that I can't shut down the OS or it will forget the date).
- nice and fine pixels, unlike the Sony PRS-505 which has the same resolution, but looks more grainy.
- it's currently BEST at BEING THE CHEAPEST e-ink device out there, you can find stores selling it for $50!
- It reads almost all book formats commonly used,
- it has TTS (text to speech),
- has excellent battery life; ranging from 1 month daily reading of 4 hours, to 2-3 months reading now and then.
You never have to turn it off, or shut it down,just leave it on all the time (and it has more than 3 month battery life), and continue reading where you left off.
- It's fast, pageflipping and OS booting time is much faster than most readers.
- It has a nice plastic coating, almost feels rubbery.

What the Astak Ez reader Pro is less good at, is:
- The screen contrast is not very high. The blacks are rather dark greyish than black.
- Also it lacks a hold-switch.
- And PDF reflow is not very enjoyable (neither is it on just about ANY device out there).
- my personal preference, on some file formats it only has a letter size of 12,16,24,... but is missing 14pt, which I would have wanted. 12 is rather small, 16 is rather big.
- It also has ridiculously large lettertypes, the ones that only give you like 5 words per screen!
- The white reader frames and buttons decolor quite quickly, after about 1-2 months you'll see the buttons you frequently use get decolored. Not a layer outside which you can wash off, but it seems to decolor inside the plastic, which you can't wash off.
- Lastly, and sadly,I read some tragic news that the guy developing the EZ-Reader Pro came to a tragic end. His support dropped, and the device now is no longer supported.
Astak has some engineers, but IMHO, none as good as the other guy.
To me the unknown technician was the Steve Apple for the EzReader line!
He now is followed by other technicians and engineers that don't have such a keen sense of engineering. Kind of like Microsoft, and intel. More is not always better; and seemingly they don't understand. Yes more pixels per screen is better, but not at the cost of battery life, or device performance, or compatibility.
If the other guy would still have been alive, he would probably have brought the ez-reader series amongst the top 3 ebook reader devices out there!

Right now the EZ reader pro is gathering dust, because I currently have a 9" reader that I use more frequently.
I used the EZ Reader pro, because of it's small form factor. I could stow it away on my desk without anyone seeing it, while reading on the job (when there was no work).
Now I don't work there anymore, and mainly use my large reader at home, because it's more comfortable to read.