I downloaded and installed ComicShelf HD and am surprised how good it is. Granted, I didn't have high expectations, but the image quality is really good. This might also be due to the high quality of our scans. I loaded up a GamePro from the mid-90s and I had no problem reading all text, without needing to zoom in. The only downside I see so far is not being able to see 2 pages when rotating the screen into landscape mode. This doesn't both me too much as I like to just focus on a single page at a time when reading.
There is a fairly active thread here (http://forums.precentral.net/canuck-coding/287405-comicshelf-hd-now-app-catalog.html) about the development of the app and showing 2 screens was one thing that several users brought up to the developer. My guess is that it'll become a feature sometime this year.
All in all, I think $1.99 was a good price for the app.