Most reviewers of this lens will talk about the lack of build quality and plasticky feel overall - and they are to be believed!!
However, don't let this put you off.
Yes this lens has a plastic mount, yes the focus ring is narrow and fiddly and yes, the autofocus motor is an older, noisier, slower type but do I care one bit - NO!!!
This lens an absolute gem. I thoroughly recommend it as a replacement for the 18-55mm kit lens (I bought it for my Canon 400D) and recommend it simply because it's a great lens in it's own right no matter what you already have. It's a nice focal length for portraits.
Where this lens scores highly is its 1.8 f-stop - very fast!!! Images are definitely soft at this setting but acceptable in a pinch. I reckon you'd need to go above A4 prints for it to be noticeable. You always have to remember that you may not have got the shot at all if you didn't have the f1.8 setting so a bit of softness is the trade-off! Noticeable improvement in shrapness is seen at f2.2 and it just gets better from there on in. Stopped down to around f4 - f11 the lens displays stunning levels of clarity and sharpness for the price (by all accounts rivalling L series pro lenses costing much, much more from what others have said- I can't personally verify this but the results I've had are truly excellent.) It also focuses down to 45 cm!
To sum up, this lens punches far above its weight. For £65 you will get a lens that gives you fantastic pictures typical of lenses costing many times the asking price. Go for it!