Just wanted to say thanks to Thor79! I've been thinking about getting a NFC ring for my Nexus 5 and I use the exact same case (plus a bit of paper inbetween) and I was wondering how well it worked.
It's a little disappointing to see that it doesn't work great, but I'm glad to hear that it's at least do-able. Time to scrape together some funds.
I'm actually sending mine back to them for them to test it and possibly replace it. One side of my ring has given out completely. The other side is still quite sensitive even with everything off the phone (no case, no dbrand vinyl skin).