I purchased this lens for my Canon 300D about a month ago.
The lens is mostly used for landscape, occasionally indoor group pictures (e.g. during a family gathering), and astrophotography.
For the f-stops I used most frequent (f/2.8 - f/16), the images are about as sharp as images from Canon's 35mm F/2.0 prime lens.
While the images are acceptably sharp, the autofocusing is disappointing. When I press the button to re-focus an already in-focus shot, the camera will hunt widely for focous. For my usage, this is merely a minor annoyance. However, it maybe detrimental in situations where pictures must be taken quickly.