There are some features missing, but overall its good.
I'm looking at some comics on it right now, it only uses the touch screen and its zoomed in to actual pixels. Shoulder buttons move back and forth between images and yes you can use subfolders. The pages are 666x1056 with only minimal loading time, and no lag scrolling around with the touch screen.
I actually prefer the image viewer with ds organize. The full image is shown in the touch screen and the zoomed in version is shown in the top screen a la the ds opera browser. It takes a little longer to load images but not enough to bother me. The high res images do look quite lovely and very readable on the screen.
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