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Kind of forget that other than Joe, probably all members here are full A/F users.
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I'm getting there Don
.....I have a sigma 15-30mm wide aoom..would value AF on my 180mm and 300mm particularly. justification is always key for me. The switch to digital was only made more palatable by getting more than expected for some old film cameras.(collectable!...were they really that old LOL)
Back to the original posting....There is also an advantage with faster / wider max' aperture lenses when relating to AF......tele /zooms particularly. A 80-200 f2.8 will normally be faster at focusing than a 80-200mm f4-5.6 for example, especially in low light conditions. This due to the camera AF sensors getting more light. It's not as obviuos with entry level digi bodies, but once you get to mid range and pro models the speed is quite noticeable.