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Cons:
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I purchased this lens to take the place of my 600mm, f/4, IS lens and found it sharper, but not as fast on the autofocus. This is apparent using a 1.4x TC (560mm) and very apparent using a 2x TC (800mm). Attempting to photograph Birds-in-Flight with the Canon 2x III TC was quite a chore. My 600mm (Not version II) is much quicker and accurate.
Without teleconverters it's a 10 out of 10, but adding TC's reduces the speed and accuracy of the autofocus.
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