Summary: Much more useful than the 18-55mm kit lens. I do have to disagree with some other reviewers about where this lens is least sharp. From my images I find that a small range at about 22mm is worst for loss of edge sharpness. I find that at 135mm, where some other reviews say it's worst, I have no problems whatsoever, even using Clear Image Zoom (2X enhanced digital).
Excerpt: This is an excellent walk around lens. Fast, sharp focus, and excellent color. I bought this lens for my A65 and liked it so much I bought another one for my A77. I have used it basically for landscape and the photos are excellent. To me it is a bargain priced lens and more than worth the price.
Pros: Consistent Output, Durable, Easily Interchangeable, Fast / accurate auto-focus, Lightweight, Nice Bokeh, Rugged, Strong Construction
Summary: I bought this to replace the 18-55 kit lens on my Sony A57. I get sharper, and brighter images from 30mm on up to 135. I also noticed at 18mm, the photos take on an almost 3d look to them, the sky looks great with good depth. It has a very useful zoom range for a walk around lens, plus, you can combine it with Sonys excellent in camera 2.0x zoom, and double the lens reach from 135mm to 270! I highly recommend it over the Sony 18-55 kit lens for great pics!
Summary: I bought one of this lens for my brother for his new a65 and after trying it out, I decided to get one for myself. It is very quite (relatively) in autofocus and I love that I can do direct manual focus without moving any switch. I haven't done any extensive test on it but from what I can see with my naked eyes, it is far better than the 16-105mm I had before.
Summary: I replaced my 35-90mm lens that seemed to have stripped gears. When I first tried this new lens I thought it was not working since I did not hear it working. When I looked through the viewfinder I saw it was working and it seems to focus quicker and very quiet. Works great and telephoto range covers any thing other than when needing a major telephoto lens.
Summary: If you are upgrading from a kit lens or looking for a lens better suited to the wide array of shots traveling can present, this is an excellent choice. The lens is built solid, has a nice weight to it, and zooms smoothly. Great value for the price.