[Riverleaf]

The keys must be carried with you any time you go to the instance. They are pretty much only for the front door. Most low level instances do not require keys.

Mobs repop behind you at a very slow rate.

You cannot solo any of the instances even to try them out. They are meant to be done in a group. Unless you are 60 and trying to run a level 35 instance it is pretty much impossible.

You cannot log out in an instance and expect to come back to where you left it. If you did all of the mobs would have repopped both behind and in front of you.