Running 10.5.3 on an Intel Imac: installed easily. After loading I changed the login screen and restarted. System took almost 3 minutes to restart. Tried a logout and the image had changed properly, but again system was very slow. I used loginox to return to original image and removed loginox from the system. Restart was very fast but I lost all my "login items" from the system preferences. Program needs to be checked, as it wasn't really smooth on my Imac.