So I have three modern Macs that I use, a work iMac, a home iMac and a MacBook, and have been using MobileMe for years to keep them in sync. I have been relying on iDisk to store a handful of key files and directories that I need to share between them. Over the years I've noticed the iDisk can be wonky. For example, on my MacBook and work iMac sometimes if I create files or folders on the iDisk, they won't show up on my home iMac for days after I put them there, if they even show up at all. To fix it, I have stop and restart the iDisk syncing. Recently, I went to grab a folder off the iDisk, and loe and behold, half of the files in the actual folder were missing. I looked in another folder I had recently moved and it was completely void of any of my files. So I called up MobileMe support. The guy on the phone actually told me (exact words) "Sometimes data-loss can occur with iDisks, which is why it is very important to back up your computer with Time Machine. This will make a backup of the local sparseBundle of the iDisk". While still a pretty unacceptable answer, I said thanks and started searching through TM backups, only to find that the only iMac with a Time Machine backup of the iDisk is the one that likes to randomly lose folders as mentioned above. Luckily, I hadn't deleted the files from my MacBook yet (which I usually do once I copy them to the iDisk). Of course it was a horrible and gut wrenching afternoon thinking the data was gone as I wasn't able to access my laptop to see if the files were still there until I got home. Yeah... we will see if I ever trust ANY data to iDisk again, especially with the answer that "sometimes data-loss can occur". With that said, I really love the Dropbox interface. At least with it, I am 100% certain if a file has been synced or not. Dropbox is highly recommended as an iDisk replacement and I am honestly thinking of investing in the 50Gb upgrade.