I have the 17-55mm f/2.8 IS...and it is the sole reason I didn't consider upgrading to a full frame camera from the 50D (instead I opted for the 7D). There simply isn't a full frame lens available that can match the versatility and image quality of that lens (in my humble opinion, that is). I would recommend it to anyone as an ideal general purpose lens for a crop sensor body. At the time of this posting, I own 6 lenses...and about 80% of the time, I'm using the 17-55mm workhorse.


I used it today, in fact, for this shot: