Downloading "Personal Documents" from Amazon's Cloud via 3G

[liketheriffle.livejournal.com]

Recently I had the opportunity to buy a Kindle 3 3G for very cheap and I decided that the higher storage on device, and also free 3G to download my ebooks at any time, made it a no brainer to go through with the purchase. However, I do have one question about the 3G - apparently downloading Amazon books from the cloud is free to do, but I heard on a forum about ereaders that downloading personal documents is not. Since the majority of what I read on my kindle are fanfics that I have uploaded to the cloud as "personal documents," I wanted to know if others have had any experience with 3G and personal documents, and could tell me if they are free or not.