After prowling all the images I could find on Flickr, and after reading a batch of reviews and statements on a few forum sites, I picked up my copy today.
Although I've got that focal length covered with 2 different zooms, neither is quite as quick. Although I am NOT too interested in it's low-light capability, I am curious about it's bokeh.
Using a crop body (7D), I know it's a bit long for the "traditional" walk-around lens, but I think it'll be fine for general photography, and maybe a really good idea for head shots, short-distance close-focus stuff like flowers, bugs, and still life.
For the pretty cheap price, I think it'll be an enjoyable addition to the bag.