Disadvantages
Time consuming process.
The AUI must be designed with varying levels of implementation in mind, and be coupled with a way to measure any particular users needs.
Requires knowing a user's goal in order to most efficiently adapt. On top of being an issue from sorting and interpreting information from the user in order to predict their needs, this can give rise to security issues. Because the information is stored, users lack privacy when utilizing an AUI.
Read more about this topic: Adaptive User Interface