I have owned this lens for several years now. It has been lovingly abused regularly during that time, as shooting interiors for the real estate industry accounts for a significant portion of my field time. I have also had the opportunity to shoot with the various contender lenses over time, and I simply love this 10-22 Canon lens. It takes a beating without denting, cracking, or developing worn areas in it's finish.
It's optical performance was eye opening on my first 30D, and it still delivers fantastic images on my current 40D, and 50D bodies. Even in the Everglades on a bright summer day, and from all compass points, the lens delivers very pleasing sharpness, contrast, and detail. It also delivers very low levels of distortion for an ultra wide zoom at any price point, and even that is easily tweaked in post processing.
My lens has untold miles of use (it is number two of the two most often used lenses for me out of the studio), yet it still cleans up to look as new, it still performs optical magic as it did on day one, and it still has the sound, smooth, mechanical feel it had when new.
I absolutely love this lens.