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Worth the price - Advantages: Nice solid lens., Good quality, fast focussing, no rotation of lens front (great for polaroid filters) - Disadvantages: a bit heavy, pricey, Canon has another lens of similar features made in USA that is cheaper, and lighter. Might want to check it out.
The 28-105 mm lens gives you an excellent range of focal lengths. From wide angle at 28mm, ideal for landscapes and and general town scenes, to short telephoto at 105 mm, which is great for portraits or zooming in on those distant scenes. I have found the 28-105, virtually the only lens I will need for my EOS30, which means I don't have to weigh myself down when travelling around. Canon now offer a 28-90 as a standard for most of their SLR bodies, but the optical quality doesn't quite match that of the 28-105. Everyone I have communicated with speaks highly of this lens. Buy it in preference to the 28-80 or 28-90 zooms you won't regret it. It's worth the extra money.