I purchased 2 of these specifically for the RFID feature. I tested both, putting my work badge in one and trying to scan from various distances. One holder definitely seemed to block better than the other which was odd. Overall, they do seem to block RFID though.

These passport holders feel awkwardly large. Also, the way the passport fits into it makes it hard to get the passport in and out (which you will have to do when going through customs). The good thing about the size is that it makes it easy to find in your bag.

Overall, the passport holders did their job, but I think the design could have been better.