It is definately 480x272. What is the ebookwise? If its that good I'll be happy. The screen on the 770 is very clear, but I think this should suffice. At least I hope so.
I'm somewhat of a collector myself, so hopefully this gadget is something I will use.
I currently have: Sony PRS-505, Ebookwise-1150, HP Hx4700, DT-375 Tablet PC, and a Jornada 720. The clarity of my Sony 505 is amazing, but I hate not having a backlight as I do a ton of reading in bed. I have the lens thingy for my 505 that is a piece of glass that lights up that sits on the screen but its just not the same. In fact, when that lit glass sits on the screen it becomes harder to read than a backlit LCD (in my opinion). I'm not big into attaching items to my screen like an LED light either. So I'm always scoping out the best LCD solutions.
The hx4700 would be perfect but the direction pad on the thing is horrible and I often just hit it by accident and it throws my page back or forward, sometimes two or three pages. Also, sometimes it registers more than a single press when I go forward on purpose. In any event, it just wasn't comfortable - but the screen sure is pretty.
The DT-375 Tablet was pretty good at first - and I really like Ubook. The problem is that its a bit too big, the battery runs out too quickly, and the OS is so old that the web browser just stinks. Still, its a pretty nifty device I picked up for like $90. The Jorada 720 suffers from the same "oldness" as the tablet but I couldn't get into the form factor the device has for reading in bed and holding/turning pages.
My Ebookwise-1150 power adapter female-end actually "fell into" my device when I plugged it in one day. So I took it apart and soldered the piece back on the board (that was a chore!). In the process, I must have done something to the screen's ribbon cable and now it glitches and goes out once in a while. It really is a shame, because of all (yes even my 505), I enjoy reading on my good old ebookwise the most...