For PDFs and technical books, I've not found anything better than iPad and GoodReader combo. It is just amazing! I also have a Kindle DXG and the PDF experience is limited there.
I don't read novels on the iPad and they are not my kind of books anyway, but iBooks does an great job on that aspect; good dictionary and nice fonts as well. The graphic layout and shelves is eye catching too.
I upload my books and PDFs using Calibre (via URL) and DropBox. No complains.
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