8 out of 10 points and recommendedGreat DC Focus, quiet with adequate speedAwful construction quality
Its focus is amazingly quiet for a DC focus lens, and in a "not bad" speed. The IS works very great that I can use 0'3" shutter speed, hand-held, though weirdly the IS creates some noise (those that you can hear) while operating. The construction quality is basically awful. While I pick up my 400D with my hand grabbing the lens, I can physically feel the zoom ring moving up and down while I pick it up, and it's got a weird lens cover that can't really fit in the lens. But if you are searching for some cheap, light long lens, this should be the choice.reviewed July 4th, 2008 (purchased for $231)
10 out of 10 points and recommendedLight weight, fast focusWeird Focus Ring
I've previously tried my friend's EF 24-105 f/4L IS USM and I'm amazed that this lens can do almost the same speed as that USM on a L lens that is about 8 times more expensive, though it is quite noisy. Build quality really is good, nothing's breaking up, at least, the only down is the focus ring, it somehow dig into your finger while you try to operate it.reviewed July 4th, 2008 (purchased for $128)
7 out of 10 points and recommendedCheap, very fast apertureQuality, both image and construction
At the end of the day, I have to say: wow! I mean, you paid the price for perhaps 10 food court lunch and you get thie mid-distant lens with f/1.8 aperture, and I have to say the quality comparing to the price, it's quite worth it. The only thing I might be complaining about is the corners, they're like darker than ever from the center on my cropped frame body, and the plastic feeling of the lens is definately worse than my two EF-Ses.reviewed October 4th, 2008 (purchased for $81)
So, the verdict would be that if you need a fast aperture lens with a very tight budget to fight, then yeah, go for it, but just don't expect much, despite its low, low price.