So, I had a 70-200 F4 I bought back in August. Great lens, but I needed something faster, so I decided to get the 2.8 non-is version and sold the F4 on ebay for $500. I bought the 2.8 from Amazon and it's great but given the extra weight, I really want the IS. So thanks to Amazon's great return policy I am shipping it back and have ordered the IS version.
Adam

