Lenses

Build quality
Optical quality
Value for money
Overall

Cons: Build quality is adequate, but for the money would like better. Rediculous that non lens hood included for this kind of money. Or pouch!

Pros: Very sharp. Excellent IS. As good as an L lens if not better, for crop sensors.

Summary: Love mine. use this on my crop as a walk around lens. Never comes off(well seldom). Sometimes a little short on reach, but thats why I have the 70-200.

Build quality
Optical quality
Value for money
Overall

Cons: lots of unsharp photos with this lens

Pros: useful focus range on aps-c

Summary: Inferior to the tamron 17-50 I replaced it with

Build quality
Optical quality
Value for money
Overall

Cons: Build quality. My copy have dust problems until added a UV filter. Crappy manual focus ring.

Pros: Excellent IQ, wide open. Excelent IS (photos at 0.5s: thats amazing)

Summary: This lens with a L build quality could be one of the best zooms in world. Excellent glass in a crappy enclosure.

Build quality
Optical quality
Value for money
Overall

Cons: Build quality could be better. Vignetting and bokeh could be a little better. High price. NO HOOD

Pros: Sharp at all apertures, colors and contrast. Excellent USM autofocus. Very good image stabilizer. Maybe the most versatile zoom lens. The best option for low light photography.

Summary: I use it mostly at f/2.8, and it's behaviour is excellent with a 550d.

Build quality
Optical quality
Value for money
Overall

Cons: Lens hood not include, plastic build quality. Expensive for 'ef-s class'

Pros: high speed and very sharp, great for low light photography and wedding photography

Summary: buy it! if money doesn't matter

Build quality
Optical quality
Value for money
Overall

Cons: - build quality not on par withe the optical quality - a bit too expensive - bokeh "can" be nervous at some backrounds - no lenshood delivered - up to 70mm range would fit better to the teles 70-...

Pros: - outstanding optical quality - constant aperture of f2.8 - homogenous IQ over the full picture, perfectly suited for landscape - no weak wide end, the 17mm setting ist actually quite impressive, even wide open - good and useful range - effective stabilizer - build quality better than it seems first - sharpness can be up to some primes

Summary: It is simply the best high-speed, constant-aperture and stabilized standard-zoom for APS-C. Perfect walkarround lens, though expensive. More affordable alternatives like tamron & sigma are much cheaper but also optically a bit worse. I hated the hefty price tag, but love performance of the lens!

Build quality
Optical quality
Value for money
Overall

Cons: Build Quality - Does not have that feeel! Slight sound while autofocusing Extends while zooming unlike 17-40 Price EF-S

Pros: Image quality! 5/5 Autofocus - very fast IS - Great stabilization (Gets quality images even at 1") Great range f/2.8 - Gets some nice blurry background even indoor.

Summary: My primary lens on 7D now. Its the best walk around lens for my purpose.

Build quality
Optical quality
Value for money
Overall

Cons: I can't complain enough about it's build quality. Well, it hasn't let me down yet but it doesn't make you confident at all. The lens has a tendency for zoom creep when pointed downwards. The zoom ring has some play after a while. The zoom action isn't linear. The paint wears out. No weather sealing. Colour rendition although it's hard to assess is colder than the much appreciated L lenses

Pros: Sharp everywhere, all the time. AF accuracy. Effective IS. Very reliable lens in terms of image quality.

Summary: This lens would be just perfect had it been built tightly with high quality components and a couple of rubber seals here and there. Now it's just a pricey very good lens.

Build quality
Optical quality
Value for money
Overall

Cons: Price. This should be L level build quality for this price. It does not come with a hood and/or bag. It should for this price. Noticeable distortion at 17mm up to f/2.8. Big. Bigger than Tamron and Sigma. I would prefer a longer focus throw (degree of turn). Makes it easier to get pinpoint manual focus.

Pros: Very sharp throughout the entire zoom. IS is excellent. USM autofocus is fast. Focus ring is excellent

Summary: This is the best normal zoom lens for Canon APS-C. Slightly sharper than the Tamron or Sigma, especially at the edge. Much better feature set (USM and IS). However it is over priced. If this was an L lens with better weather seal and comes with hood/pouch it would justify the price. But it is not. I still bought it because I don't like the Tamron and Sigma lenses.

Build quality
Optical quality
Value for money
Overall

Cons: Big (good filters can be expensive), No hood included

Pros: GREAT IQ; Sharp; Great low-light lens;

Summary: The best walk-around, general purpose lens for cropped-sensor Canons.

Build quality
Optical quality
Value for money
Overall

Cons: - No hood included; COME ON Canon! - No seals; collected lots of dust within a few weeks. - Stabilizer broke after 2 months and had to be serviced. The wait was irritating. - Not a FF optic. ;)

Pros: - Sharp. No, not like this: SHARP. - Stabilized. - Great range.

Summary: I had this on a 30D as the only lens for over a year and was making due all right (except for theatre shoots where I naturally felt awkwardly). It's a great all around lens, if only it had been built better and had better QC...