Here is a review left by a customer on a product. Would you say he was satisfied or dissatisfied?
Title: A great Lens
Review: Worth every penny! I was caught between this and the 400 f4. I decided to go with this and the doubler. You lose two stops with the doubler, but it's pretty close to the 400 f4. You have 2 lenses in one with this and a doubler. And this one is fast and shoots in low light! I love it!
