I just installed the app.
A few things:
1. At install I got the message that the application was for an older version of Windows Mobile (I use Windows Mobile 2003 SE). But it works, so I'll skip that one...
2. When I opened the book, I got 2 letters on my screen. The lettering was huge! I had to click about a dozen times to make the font even readable... This may have something to do with point 1 though...
3. It doesn't remember the font I choose. I put it from Tahoma (the default) to Fontin, but when I closed and opened it, it was Tahoma again. The same with the font-size. It keeps reverting to 10 point.
4. The paging is nice and fast, but...
5. I like the large buttons, easily touched using my finger instead of the pen. But it's annoying that the "menu" will pop-up and cover half the screen if I accidentally touch the screen.
6. This is a major drawback for me: it doesn't respond to my buttons. I can go to the next page using my scroll wheel. I can't use the buttons. And I almost never use that scroll wheel.
An image of my PDA:
It's a Fujitsu Siemens Loox 720.
7. I just got an error because I changed my default folder. The book I had already opened wasn't in that folder (naturally!), but it did show on the first screen. So, I clicked it. And got an I/O error because it couldn't find the book
8. So, I moved that book to the new ebook folder (which is the same as my mobipocket folder), but according to the reader there are no books in there

(if I move it back, it will find the book again)
I assume that green bar with the green ball on it, when you open the "menu" is a progress bar? I'd like to see that always...
So, overall, it looks nice, but in my case, because of point 6 (and somewhat because of point 5), not really handy to use. And I'd love to have a good epub reader!