Yes, I would recommend this to a friend

Consistent Output; Lightweight; Sharp Focus; Strong Construction

This lens is excellent The build quality and picture quality are both superb. It is basically the APS-C equivalent of 70-200 on full frame (just a touch longer). If you are looking for a lens of this focal length range, I doubt if you could beat this.

Great Picture Quality

Very nice lens for indoor portraits or outside. Focusing is silent fast and accurate. Very well made with focus friction override and zoom anti-creep (when you hold the camera up or down). You'll probably have to hold the lens when shooting as it is somewhat heavy.

Was in debate to go for either the Tamron 70 200 or this Sigma. With the aim of replicating full frame reach whilst saving many pounds, I am not disappointed, it offers a very practical focal range. This lens is very sharp with excellent colour contrast.

I really like this lens. It is my first "professional" grade lens and I am VERY impressed. The sharpness of my photos is a magnitude above that of the kit lens for my Canon T3i. Photos taken with this lens are tack sharp! I read some reviews stating that at F2.8 there is softness at the edges.

Much Cheaper Than L Glass; Quick Focus; Very sharp

Heavy; Large; Not For Full Frame Camera

Quick focus, sharp photos, great lens for mid range. Speedy delivery.

I really like this lens. It is my first "professional" grade lens and I am VERY impressed. The sharpness of my photos is a magnitude above that of the kit lens for my Canon T3i. Photos taken with this lens are tack sharp! I read some reviews stating that at F2.8 there is softness at the edges.

Much Cheaper Than L Glass; Quick Focus; Very sharp

Heavy; Large; Not For Full Frame Camera

The new Sigma APO 50–150mm F2.8 EX DC OS HSM designed especially for APS-C size image sensors is a fast f/2.8 telephoto zoom lens with a focal length equivalent to 75–225mm in 35mm format. Un-boxing it you have the well-padded sturdy case that comes with every Sigma lens in this range.

Fixed f/2.8 aperture; Four stops OS; Pro focal range; Lightweight for a telephoto

Too large for most hobbyists; Only for crop sensor; Vignetting

Great zoom lens with large aperture! Being able to get telephoto with f/2.8 is what I needed and the lens produces great pictures on my Nikon D7000. Build is very solid, zoom and focus rings are smooth. Only issue is its a bit heavy, but what do you expect from lens with this capability.

Consistent Output; Durable; Fast / accurate auto-focus; Nice Bokeh; Strong Construction

Heavy

This telephoto zoom lens for use with APS-C format cameras offers a 3x zoom range equivalent to a 75-225mm lens used on a 35mm camera, a fast constant f/2.8 maximum aperture, silent autofocus and optical stabilisation.