The Sigma 18-250mm f/3.5-6.3 DC OS HSM IF lens was announced on 15-January-2009 (read the press release).
This post is a compilation of links to the following Sigma 18-250mm (Canon Mount) resources:
Professional and user reviews, owner opinions and experiences, tests, ratings, conclusions and feedback
Sigma 18-250mm F3.5-6.3 DC OS HSM Lens Review at PhotoReview Australia
Margaret Brown, the reviewer, tried the lens out on a Canon EOS 40D and Digital Rebel XTi / 400D, and notes:
Imatest showed the review lens to be a competent performer for its focal length range and price tag. Although it didn’t produce stellar results in Photo Review’s standard tests, the review lens delivered good resolution at aperture settings between f/5.6 and f/16 for all focal lengths we were able to test.