Yeah, when I had my ring, it was very difficult on the note 3 for the first day or 2. Basically didn't work at all. Once I got used to it though it was alright. Usually only took a couple seconds to get it to unlock with an occasional failed read. I imagine all phones will have some amount of that which sadly I guess for a lot of people isn't acceptable. Things must work as they do in the movies where you just tap it and it immediately knows your intent and works. :p Anything RF/inductive will never be that way...
I still can't get it to read (and the NFC tags I bought on Amazon [i:2l5lyubk]do[/i:2l5lyubk] work immediately