Here is a review left by a customer on a product. Would you say he was satisfied or dissatisfied?
Title: Great IQ but poor AF operation
Review: Very sharp lens but AF operation is very hit or miss, even at non-macro focus distances. Acceptable focus was achieved less than 25% of the time under standard lighting conditions. This may be specific to my copy as others have not reported this problem. I also had a Sigma 150mm macro that had to be returned for the same reason so I suspect that at least some of the EF-mount Sigma lenses suffer from this problem. Hopefully they will fix this as it is a wonderful lens excepting the shoddy AF performance.
