I just got my RFID wallet, and tried it on the metro card reader.  The scan typically picks up my metro card inside my other wallets, but this time it didn't. So I guess it works.  The complaints that I have are minor.  One, it doesn't have a latch. So I purchased and attached a 3M Velcro Latch and it did the trick.  Two, it can get a little bulky if all the slots are fully utilized.  Nonetheless, I may continue to use this wallet after returning from my vacation abroad because it will be less bulky without my passport inside.