Out of curiosity, if I upgrade my JB iPad 2 to 5.0, or even 4.3.5, just any un-JB-en iOS version, how much will I lose? Just access to cydia and the ability to dl new packages, or will my existing packages like iFile and retinapad stop working? I realize that some may simply be incompatible with new features in a new version, but I'm talking about losing all cydia packages across the board or not.