I'll throw in the dissenting opinion for what it's worth!
I'm a Canon fanboy and I love their glass. Is this for a Canon camera? Nikon, Sony, etc?
If it's a Canon I'd look at the Canon 100mm prime macro. It used to be in their L-Series but they dropped it down to their regular line to promote their new (at the time) zoom macro. The glass is outstanding and the lens is very high quality. I've taken some outstanding shots with it.
If it's not for a Canon then don't worry about it because it will suck anyway. (baaazinnnnggggaaaaaaaaaaa!)
