[Nate the great]

I have 2 reasons: there's no sleep mode, and the ergonomics simply don't work for me.

As I see it, the purpose of such a small device is that it is more convenient to always have with you than a larger one. This is so you can read whenever you have a few minutes. For example, I like to read at stop lights. Because the Opus doesn't have a sleep mode, it takes too long to boot. I don't have any time to read. Without the ability to read in snatches, there is little point in picking the Opus over a device with a larger screen that costs about the same.

I don't like the menu button. Every time I use it I make a mistake. I understand that it needs to be small, but it doesn't have to be a single piece. I would prefer a design with the arrow keys as 4 separate buttons, and the enter key to the left or right. If the arrow keys were separate then I don't think my finger would slide sideways quite so much and press the wrong one.

I also don't like the placement of the page turn buttons. I can't find a way to securely hold the Opus and keep a finger near them other than to place my thumb on the screen. If my thumb is on the side of the screen then it doesn't feel like I have a safe grip on the Opus.