This and a Tokina 12-24mm ultra wide angle lens are my travelling companions everywhere I go. The Tokina is wonderful for landscape/seascape shots, the Canon 70-300mm for getting in nice and close for sharp detail. I've also used it very successfully for portraiture (allows you distance, so no need to crowd your model) and for fine art photography subjects. It's an absolute boon for travelling, being fairly light, and the image quality is consistently high every time. Thanks to the Image Stabilisation, hand-held shots, even at the full telephoto 300mm range of things, are plenty sharp enough and despite its relatively small aperture, the IS ensures the lens performs well in fairly dingy light too - providing you know how to set your camera up right. Okay, so the build isn't L class, but then you're not paying L Class money either. For a very useful and extensive zoom range, image quality, and convenience, this lens is invaluable and excellent value for money.