I have tried a few manuals and a pdf of a spread sheet I needed for a meeting it was OK, I would want to use it all the time.
It was great for a few of the graphic novels I tried ( although B/W).
It isn't really a pdf reader, if that's you main thing you want go for a reader with re-flow and/or larger screen. The Kindle DXi will give you the bigger screen or wait for the new version of the DX with wifi and new bells and whistles that would seem logical for them to bring out.
Several of the other reader support re-flow of the pdf text Sony etc. its not something Amazon seems to be keen to add.
I am happy as most of the pdf's I have convert fine with Calibre as they are not layout sensitive.
Hope that helps,
G
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