Customer Rating: 
Summary: Great value
Comment: Great value for this lens, I'd recommend the 50mm 1.4 for anyone shooting sports or action since it will focus faster using USM.
Customer Rating:
Summary: Great lens for the price!
Comment: This is a great lens for the price. I love it. I use it on my camera as a default lens. In spite of the low price, I've found it to be very structurally sound.
Customer Rating:
Summary: lens
Comment: Fantastic image quality. Little noisy and slow to focus at times. But definitely a great purchase.
Customer Rating:
Summary: Great lens
Comment: Excellent travel/portrait lens on an aps-c sized sensor. Fast, light. Probably not the most durable, but still (even though price has gone up 15 bucks) about the best deal on the internet. 1.8 provides nice BG softness, and on my 40D it seems to have great corner to corner sharpness at most f-stops and I have had no auto-focus issues. Nice color, low CA; for the price, I don't think an EOS could find a better lens. I also shoot with the EF 28-135 IS and the EF 16-35L (though the latter is an intermittent loaner from a very kind friend.)
This is obviously not the EF 1.4 or the EF 1.2, but it's also 1/4 to 1/12 of the price, and much more portable. The only minor "drawback" is that the "hood" supplied by canon is actually a catch all for smaller lens fronts, though they sell it as a dedicated hood, a bit of a price-gouge on that. You can buy a third party hood and get equally good results.
Customer Rating:
Summary: Smashed on impact....
Comment: I am only an amateur photographer, but I thought the picture quality, ease of use, and versatility of this lens was terrific for the cost of the lens. Recently, however, I had the misfortune of having my Canon 40D - with this lens attached- fall out of my camera backpack, and the lens completely disintegrated on impact. (The camera fell from a distance of @1.5'). This wouldn't have been so terrible if not for the fact that not only did the lens housing shatter into pieces, but the lens mount bent and the lens could not be removed, making the camera completely inoperable for that day's picture taking. I had to take the whole setup to a Canon repair site in NJ, since the camera had to be taken apart to remove the damaged lens. (Luckily, the Canon 40D survived the fall.) Obviously camera lenses were not designed to be dropped on asphalt, but accidents will happen, and had the lens had a sturdier housing, I don't think the mount would have bent so easily. I've had other Canon lenses survive worse falls than this and still function.
Summary: Great value
Comment: Great value for this lens, I'd recommend the 50mm 1.4 for anyone shooting sports or action since it will focus faster using USM.
Customer Rating:
Summary: Great lens for the price!
Comment: This is a great lens for the price. I love it. I use it on my camera as a default lens. In spite of the low price, I've found it to be very structurally sound.
Customer Rating:
Summary: lens
Comment: Fantastic image quality. Little noisy and slow to focus at times. But definitely a great purchase.
Customer Rating:
Summary: Great lens
Comment: Excellent travel/portrait lens on an aps-c sized sensor. Fast, light. Probably not the most durable, but still (even though price has gone up 15 bucks) about the best deal on the internet. 1.8 provides nice BG softness, and on my 40D it seems to have great corner to corner sharpness at most f-stops and I have had no auto-focus issues. Nice color, low CA; for the price, I don't think an EOS could find a better lens. I also shoot with the EF 28-135 IS and the EF 16-35L (though the latter is an intermittent loaner from a very kind friend.)
This is obviously not the EF 1.4 or the EF 1.2, but it's also 1/4 to 1/12 of the price, and much more portable. The only minor "drawback" is that the "hood" supplied by canon is actually a catch all for smaller lens fronts, though they sell it as a dedicated hood, a bit of a price-gouge on that. You can buy a third party hood and get equally good results.
Customer Rating:
Summary: Smashed on impact....
Comment: I am only an amateur photographer, but I thought the picture quality, ease of use, and versatility of this lens was terrific for the cost of the lens. Recently, however, I had the misfortune of having my Canon 40D - with this lens attached- fall out of my camera backpack, and the lens completely disintegrated on impact. (The camera fell from a distance of @1.5'). This wouldn't have been so terrible if not for the fact that not only did the lens housing shatter into pieces, but the lens mount bent and the lens could not be removed, making the camera completely inoperable for that day's picture taking. I had to take the whole setup to a Canon repair site in NJ, since the camera had to be taken apart to remove the damaged lens. (Luckily, the Canon 40D survived the fall.) Obviously camera lenses were not designed to be dropped on asphalt, but accidents will happen, and had the lens had a sturdier housing, I don't think the mount would have bent so easily. I've had other Canon lenses survive worse falls than this and still function.