I just got mine, first impressions, very nice. I put selector.adf in root of usb stick, copied an adf in root, tried it and it worked. I created a directory called A_Dir and put a game in, the bootup manager allows you to go into the directory and boot from there so very nice indeed
Did a cold boot after playing Addams family in the A_Dir and the computer boots right up into the game so it remembers previous selection
Once you assign a slot to an adf you can simply use the 2 buttons to select the slot number and then do a warm reset and the computer will boot the selected slot. If you want to return to the boot selection menu press buttons to go to 000 and then reset