Erez Katz

I took down one point because it doesn't have HSM(and I actually feel guilty for doing so)

This is an incredible lens.
I also have the Sigma 150 for longer reach and other perks.
Optically this one is just as good if not a tiny bit sharper.

I use this lens as a workaround with macro option, portrait (too sharp actually for people faces) or when I want to get closer to the subject (the 150 has a 40cm minimal distance, and sometimes it is easier to get a better angle when you can get closer).

Here are a few pictures I took recently with this lens:
http://www.pbase.com/katzer/image/77263567
http://www.pbase.com/katzer/image/77263565
http://www.pbase.com/katzer/image/74290345
http://www.pbase.com/katzer/image/77263569

I cannot recommend this lens enough.

Erez Katz
http://www.pbase.com/katzer/