Bearing in mind how much a Nikon/Canon equivalent lens will cost, this represents unbeatable value for money. Images are clear and sharp, the AF and VR both work well. As another review has said, there is some noise from the internal workings of the lens - but as I use mine 99% of the time for stills photography it makes no odds.
Is well built, solid with a nice weight to it.... and the images are nice and bright with good colour rendition and little in the way of distortion. As with most lenses at 17mm there is a very slight amount of barrel distortion - but this can be easily fixed in Photoshop or similar.
All in all, I'm delighted with it - and if you've been used to a "kit" lens then this will blow you away! Go on, treat yourself!