This is my second maro lens (first was Canon 60/2.8 macro, used on Canon 60D for 3 years).
What can I say about this lens? It's sharp like 60/2.8 (I don't see difference in picture resolution, maybe at f/2.8, 100/2.8 IS is sharper), it has IS and it's weather sealed.
Soon I will add more photos and videos too, because I am using this lens from few weeks.
My blog about my previous lens:
Aperture - f/6.3; shutter speed - 1/100; iso 500 (1:1)
Aperture - f/13.0; shutter speed - 1/80; iso 2500 (no iso reduction)