I took this new lens and my 300D out today and got a few shots. Below this image is a link to the full-sized version (warning: almost 4MB and I only have about a 384Kbps upstream cable connection).
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(click for original)
1/500s, 300mm, f/5.6, ISO 200.
Minor photoshop correction: unsharpen (~ 1.6px, 30%), saturation and contrast tweaks, but the sharpness is really very good compared to the stories I had heard. Sorry, I threw away the CRW file on this one and can't post an uncorrected, but I can say that I tend to undersharpen rather to avoid that digital-sharp look (where the noise is sharp and the picture still blurry).
The autofocus seemed faster than the kit lens today, but it was slower earlier this week in poor lighting. Overall, I was very happy with the performance today, and it was the first time I really had a chance to try it. Combined with the Digital Rebel's 1.6x magnification factor, I couldn't believe how close I was able to get for under $200.