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Everyone here is right. This is a great lens in whatever configuration.
I opted for the 2.8IS for two reasons:
-I (try to)do a lot of low-light photography of animals and the extra stops and IS make VERY big difference which leads to reason 2: with the f2.8 version you retain the cross-hair AF in the central point which again makes a difference if you're trying to shoot something moving in low light.
However if you are going to be mostly shooting during the day, the f4 is a fine choice. However don't reject the earlier non-IS version - they were made with fluorite and lots of lead (Pb) in the glass! Very sharp. The copy I had was the sharpest zoom I've ever seen.
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