The Canon EF 70-300mm f/4-5.6 IS USM is a lens with terrific performance and great optical quality, which compares well with more expensive models. Although it comes with no hood and delivers slightly degraded picture quality in low-light situations, but these shouldn’t be deal-breakers for professionals.
The IS feature admirably reduce blurs even when used by people with unsteady hands. The internal gyro sensors detect subtle vibrations and trigger correcting lens group to move correspondingly. The small USM motor uses ultra-sonic frequency vibrations to drive the autofocus feature in near silent operation at unrivalled speed.
Another Review of Canon EF 70-300mm f/4-5.6 IS USM Lens Review