I sent in my HID Proxmark III building RFID FOB and they made 2 clones for me that work flawlessly! As annoying as it was to part withy my FOB for a week, I'm now very pleased with my decision to have done so. In retrospect, I do wish I hadn't skimped on the shipping costs both ways. I paid for Priority mail, but next time I would do next day.
I got the "Sticker" and tagged on the Strap version for only an extra 10 bucks. I think that was worth it. FYI, I had planned to store the "Sticker" between my iPhone and the case..however, it will not work through the case. So, while I have been storing it there, I have to take it out of the case every time to use it.
All in all, I highly recommend.