Rating: 
Summary: Sweet.... a pleasure to use, just a little heavy
Review: Owned 2 weeks:
The only thing to cause me to stop short of 5 stars is the weight of the lens. Stabilization is great and worth every dime. Don't even think about the other 75-300mm non-IS version, it is junk - I tried it. You can hand hold this lens at 300 mm at 1/60!! No kidding. Focus is fast and accurate with my Digital Rebel - almost no hunting like on the other 75-300mm. You *must* get a skylight filter to protect the front element.
I'll update this review after a few months' use.
Rating: 
Summary: Canon EF 75-300 f/4.0-5.6 IS USM
Review: The world's first interchangeable lens with a built-in image Stabilizer (IS), the Canon EF 75-300mm f/4-5.6 IS USM lens - designed exclusively for Canon EOS cameras, dramatically reduces the chance of a blurred photograph due to camera motion ("camera shake") especially when shooting at long focal lengths with slow shutter speed. Controlled by a built-in 16-bit microcomputer, a series of gyro sensors and micro-motors instantly shift one of the lens groups to compensate for inadvertent camera motion. A very practical benefit of the IS system is a reduction in the old "focal length = shutter speed" rule by two full stops. Now you can expect sharp pictures at 200 mm with a shutter speed of only 1/60th second!
Rating:
Summary: A good outdoor lens
Review: This is a good outdoor lens for sunny days photos due its small aperture. I'm using it to shoot dragonflies, other small animals, and birds. Unlike his sister, the 28-135 IS USM AF, it lacks the possibility of doing full autofocus manually when AF is set. This means that whenever we didn't manage to get focus automatically we must shift the operation from AF to MF. In the 28-135 IS USM AF we can make fine adjustments in the focus manually wihthout changing to MF. Otherwise this is a good lens. The USM motor function very well and the IS (image stabilizer) works proper and silently. To obviate its small aperture we can change the digital camera ISO to a high one, ex: 200 or higher. Bigger the shoot speed (above or equal to the focal length) better the photo, this a thumb rule in photography.
Rating:
Summary: An excellent lens for 300mm (480mm in 35mm) max reach.
Review: This is my third lens, I already have the amazing f1.4 50mm and the truely great 28-135mm IS. Comparing this lens to the 28-135 IS, this lens is very slow to focus, has difficulty focusing in low light, and the photos it takes are not nearly as sharp. On the other hand... it's a 300mm lens - it'll take you quite close to a subject, and the IS means that you can handhold it in reletively decent light. Two big drawbacks - the IS doesn't work on tripod, and it doesn't have a "real" USM motor, so you can't mix AF and MF modes, you have to choose between modes with a switch. If I had to do it over again, I'd probably still get this lens, since the next level up (70-200 IS) is four times more expensive, and even the 50-500 is twice as expensive. If you intend to handhold shots, the IS is probably worth it over the non-IS version.
Rating: 
Summary: Not bad, but not great (like the 28-135mm)
Review: This is my third lens, I already have the amazing f1.4 50mm and the truely great 28-135mm IS. Comparing this lens to the 28-135 IS, this lens is very slow to focus, has difficulty focusing in low light, and the photos it takes are not nearly as sharp. On the other hand... it's a 300mm lens - it'll take you quite close to a subject, and the IS means that you can handhold it in reletively decent light. Two big drawbacks - the IS doesn't work on tripod, and it doesn't have a "real" USM motor, so you can't mix AF and MF modes, you have to choose between modes with a switch. If I had to do it over again, I'd probably still get this lens, since the next level up (70-200 IS) is four times more expensive, and even the 50-500 is twice as expensive. If you intend to handhold shots, the IS is probably worth it over the non-IS version.
Rating:
Summary: Incredible!
Review: This lens almost never leaves my camera. I love it! The image stabilizer is fantastic, you simply zoom in, push the shutter release half way and the image stabilizes. It is incredibly useful especially in unplanned situations without a tripod. I've used it to capture sports action shots, parachuting, portraits, you name it. Incredible zoom that practically eliminates blur due to camera shake.
Rating:
Summary: Absolutely Awesome
Review: This lens has changed my whole outlook on photography. Compared to my old Canon T50 80-210mm lens, this lens is 10 times better. I can zoom up to 300mm and with image stabilizer on and get breathtakingly clear pictures that are bright colorful and just plan beautiful, even in cloudly weather. The lens is quite heavy and feels solid compared to cheaper Canon lenses. It costs about twice as much as canon's non stabilizing lense but definitely worth the extra [price]... I'm hoping this lense last me for years as I am just really happy that it takes awesome photos. Don't think twice about buying this one, spend the extra $$ and you really won't be sorry.
Rating:
Summary: Sharp, fast and quiet... what more could you ask for?
Review: This lens takes outstanding quality pictures! I have taken excellent pictures in all light situations with this lens. Having the zoom range and the image stabilization together make things so easy without having to lug around the tripod.
I also have a new make of the USM moter and haven't noticed much difference in speed between the two. Maybe the other person who posted had a faulty lens.
This lens delivers in every aspect ---other than the fact that it's not a L series! :)
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