I bought this lens from a well known high street photographic retailer yesterday afternoon - and promptly returned it this morning.
I really wasn't expecting a lot for my £200 but this was total disappointment. I took the salesman's advice as I'm a bit of a novice and bought this lens as it 'satisfied my requirements'. How I wish I had taken time out to check the reviews on this and other sites.
The build quality was very poor, so much so that I was afraid of breaking it! A previous reviewer likens it to a child's plastic toy - how right they are. I took about 40 - 50 shots when I got home but can't say I was actually impressed with any of them. They were ok I suppose but I just expected a little bit more from a Canon lens.
What did I get in exchange? - The Sigma APO equivalent which is much 'chunkier' , feels like a real lens and image quality is just fine. Oh, it was £40 cheaper as well.