I can only echo what other people say about this lens.
It isn't loaded with state of the art gizmos, it isn't built well and it'll probably break into a thousand pieces if you drop it......but who cares? For £70 you can go and buy another!
OK, so the AF micro motor is loud and it will hunt in low light, but this is not an L series lens. This little piece of Japanese plastic will take stunningly sharp pictures with great colour balance at all apertures. It focuses down to about 18 inches and, wide open, this lens will throw everything out of focus into a rich, creamy background blur on a par with lenses costing many times more.
If you've recently bought a DSLR/EF-S kit lens combination you will have seen the limitations of the lens when viewing pictures at 100%. You certainly won't be disappointed with the image quality of this lens. It is superb in all situations from portraiture to landscape and this lens really excels in low light. The lens has an 80mm equivalent on 1.6x crop-factor bodies and, as others have said, you will need to think more about composition - but one thing is for certain....you will never regret buying this lens.
It is a cheap and obvious progression from the low quality kit lenses that many people encounter through their first DSLR camera.
I don't work for Canon either, but if I did, I'd sell thousands of these!!