The lens is amazing. The image stabilizer definatly helps clean up your shots. Also the lens can be locked at 70mm to prevent from sliding out. I was debating between this lens, and the 28-135 IS lens, but i choose this lens over it mainly for the longer zoom.

Image stabilizer; Long range; USM

Have to stand at least 5 feet away from subject to focus

Candids of grandchildren, or anyone in fact. Easy to carry around on Canon 5d mk 4, even though a bit weighty! Well balanced. Excellent and consistent results. Would buy from Wex again, no problem.

Consistent Output; Durable; Easily Interchangeable; Quick Focus; Rugged; Sharp Focus; Strong Construction

This is definitely a high quality lens, not as slow as it says on paper, image quality maintains high even at max zoom with lots of details. Unless you are shooting high speed events, I see no need for L lenses, this will work for me just fine, I mean, more than just fine!

One of the better Canon glass . Vastly reduces any camera shake and the pictures come out awesome due to negligable shake induced blur.. Tremendous in low light conditions and I have taken some fantasic pictures using this lens..

This lens does everything I had hoped. There is a huge difference in this lens compared to the 75-275mm. I love it.

Love using this lens. It really has increased my overall use of my DSLR. I am able to take photos from a distance and really capture a natural shot since I don't have to be close to the object. Overall I am very happy with this lens. Would recommend to any starter using a DSLR.

Durable; Fast / accurate auto-focus; Strong Construction

Heavy

"In this zoom range there are many lenses to compare and it wasn't an easy decision. For me it came down to this lens or the 70-200 f/4 L IS USM and after trying both in the store I went with the 70-300 .

If you're on a 1.3x or 1.6x crop body (the XTi for example) will give you 112-480mm, which is nice for the extra distance, however, if your wanting to be up with your family and friends and get full body shots you have to be standing quite far away.

Excellent image quality while not an L series lens with a wide aperture it still rocks in cloudy/low light conditions; I've taken 2,000+ images with this lens and it has not let me down

Louder auto focus than other USM lenses, not by a lot though; Autofocus hunts in lowlight at 300mm

This lens is highly versatile and rarely requires me to change lenses. It is a genuine Canon lens with the packaging you would expect to receive if buying the same product in Australia.

I haven't had this lens long but have found it to be excellent. It is quite expensive so I gave it 4 stars for value. This is not a reflection of the quality but just the price. I did receive the money back from Canon quite fast this time in contrast to my previous experience.