Simple and elegant
Simple design and keeps the overall aesthetic of the Fantom X. Since it's not RFID blocking, I use the slot to hold my transit pass. Screws into the back of the wallet and remains secure. The plastic seems to be a softer plastic, so I got some 3M film and applied it over the surface of the ID holder to protect it from any future scratches or abrasion when I set the wallet down. Overall, if you need an extra slot for a pass or RFID enabled card that you use frequently, I would recommend this small add-on.