I also have the 28 - 300mm 1:3.5 - 6.3 MACRO (for about 4 years now) & love it - It almost never came off my camera until recently when I bought my 70-200 2.8. I still use the Tamron for most day activities (such as the San Antonio photo walk). I think the Tamron's focus isn't quite as sharp as the Canon lenses but, honestly I wonder if that is not just my imagination. I know that I still use my Tamron a bunch and am not considering replacing it with a Canon. I do know this, I have NEVER regretted buying the Tamron over another lens.
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Camera: Canon 50d
Lens: 50 mm 1.8; 28-300 3.5-5.6; 70-200 2.8 IS; 17-55 2.8
Software: Adobe CS4; Lightroom 2
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