Summary: This is the perfect real estate lens if you know how to use it. I see many complaints about soft corners, but I do not have any problems with my copy. Most prime lenses will not be their best used wide open. Even so, this lens is plenty sharp wide open for interior real estate photos.
Conclusion: Short and simple. This lens is does exactly what I expected it to do - take great photos. One can get a balanced impression and make a judgment about this lens by reading all the reviews. It is made for the serious amateur, maybe not for the pro.
Excerpt: This is a very good lens for the price. The equivalent L lens at 24mm is about $1000 more. If you dont want the additional wider aperture of the L lens and dont need the better build quality, this is a good alternative. Not quite as sharp as the L and I find the L shoots much better at 2.8.
Excerpt: I was hesitant at first but am very glad I made this purchase. Finally I can capture everything I want in the frame without having to say, "I wish I had a wide angle lens." I really like the way the lens vignettes. Great for low light shots. Perfect for walking around town or taking a hike.
Pros: Consistent Output, Durable, Easily Interchangeable, Fast / accurate auto-focus, Lightweight, Nice Bokeh, Rugged, Strong Construction
Summary: I like this lens. I purchased this as my Rebel did not come with a wide angle lens. The only con I can see is that you can't zoom in and out only focus at one distance (Only reason it is a 4 star rating). It would be nice to be able to zoom in closer and still get a wide angle shot.