This lens is Canon's ‘cheaper' version of the highly rated 70-200mm f/2.8 L IS USM. Leaving out the Image Stabilisation and making the lens one stop slower at f/4 make the saving. Otherwise, Canon claim it has the same quality glass and construction.
Great build quality; Good and consistent performance for price; Silent and quick autofocus
Chromatic aberration on the borderline; Tripod mount not included in the price