I have the 40D, and close to 20k shots with no problems. I have never had the Error 99, but I have seen it on other bodies (50D, 20D), and it is usually a problem with dirty lens contacts.
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40D and Rebel XT (LifePixel converted), Canon 24-70 f/2.8 L, Canon 70-200 f/2.8 L IS, Canon EF 50 f/1.4, Tamron 90 f/2.8 Macro, Tamron 11-18 f/4.5-5.6, Tamron 18-250 f/3.5-6.3, Tamron 200-500 f/5-6.3, Lensbaby 3G
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