@ODEMAS

If I'm not too late to contribute here, I think the deciding factor is whether you shoot with a flash. I never use ambient light for product photography. I use flashes so that I have total control over the light hitting the subject. With a flash there is no advantage to using an image stabilized lens because the image is sharpened by the short pulse of light that has a duration of just 1/8000 to 1/10,000 second. What you might want an IS 100MM lens for is shooting other things -- like people, it's a great portrait lens -- without a flash.