You need to link the skill with a RingByName account in order to use it. Yes, it works well. However, Amazon's speech recognition from Alexa is a challenge for names. Works fine most of the time for American names, but it struggles with foreign names. Results also vary depending on the accent of the user, so our skill always repeats what it got from Amazon to make sure users don't call someone else. We had to do some "magic" in the backend to try to find a contact even though an exact match wasn't found, which works very nicely.
