Pros
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Compact, build quality, dust reduction, improved AF, good Raw file quality.
Cons
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Chroma noise especially in JPEGs, position of DoF preview button, limited purchase of right-hand grip.
Verdict

There’s no doubt that the 400D will be just as successful as the 350D, if not more so. Canon has added some really useful features and made a camera different enough to warrant an upgrade, without changing the basic functionality of previous models. Different but familiar is always a winning formula, and we doubt Canon will be knocked off the top spot by the young pretenders just yet.