I'm looking to buy one after i replace my 5Dc with a 5D2. what store is the best to buy it at? I love shopping at adorama, bh, and amazon.. but which would be best in the event that sigma's AF is faulty? I don't want to have to ship it back, wait a week for them to get it, wait a week for them to process the return, then order a new one and wait some more.
If it does malfunction, do return it and then order another.. or will the store be able to just exchange it for another copy?
any suggestions and experiences are appreciated



