Tannin
Storage? I am Storage!
^ Listen to Lunar.
I've never used a 17-55 IS but I know enough about it to be very cnfident that it is simply the best general-purpose lens available for 1.6 crop. (My GP "lens" is arguably even better, but that's because I use two with two bodies: 20D & EF-S 10-22, 50D & EF 24-105/4. I came to really appreciate the extra long end the 24-105 gave me on the 1.6; equivalent to 38-168 on FF. Well, three really - lately, I seldom use the long end of the 24-105, as I tend to gravitate to 1D III & 100-400 any time I have a half a chance.)
I've never used a 17-55 IS but I know enough about it to be very cnfident that it is simply the best general-purpose lens available for 1.6 crop. (My GP "lens" is arguably even better, but that's because I use two with two bodies: 20D & EF-S 10-22, 50D & EF 24-105/4. I came to really appreciate the extra long end the 24-105 gave me on the 1.6; equivalent to 38-168 on FF. Well, three really - lately, I seldom use the long end of the 24-105, as I tend to gravitate to 1D III & 100-400 any time I have a half a chance.)