I've had mine for about 10 days, and I'm perfectly happy with the size.
If anything, I should be the one complaining. I went from a 12.1" ultra-portable to this 15.4" widescreen desktop replacement (don't worry, I had good reasons to switch).
Anyway, the MBP looks razor thin and is still the lightest notebook in its class. Personally, I appreciate the extra screen real estate because it allows me to comfortably view various open windows/programs. If you can justify the need for (1) the power, and (2) the screen size, then you won't be disappointed. Like any computer, it will take a little getting used to, but you'll be fine.
Oh, and concerning the sharp edges, I don't find them to be bothersome at all. I was a little worried about them myself, but if your chair is at the appropriate height, it's a non-issue.
My defective HD on the other hand...