I have the Sigma, since I couldn't find a Tamron for my Olympus system. I love it...it auto focus' well, and I love that I can stay at 2.8 throughout the entire zoom range. I guess it's not a true Macro unless you are at 35mm, but I've shot some cool macro shots with it.
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Susie
MY GEAR: Sony Cybershot; Olympus E-500 DigitalSLR
MY SOFTWARE: Lightroom 2; PSE7; Photoshop CS2; Wacom Intuos 3 Graphics Tablet; Painter 8.
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