Super lens.  Without question my go-to lens in the studio.  Fast, sharp and worth the cost many times over.

I have the Canon 100 f/2.8 and couldn't be happier. It's a great macro lens and a very useful portrait lens. 

Becoming exclusive on istock was the single most important thing I have done to juice up my stock sales and income in microstock.  Sure there are plusses and minuses but all in all, there is no other site I'd rather be on and exclusivity makes a huge difference in income.