We've had a few around here for over 15 years or more. Some single lane, some double lane. Some people that drive them every day still don't seem to understand them. They stop before entering even though there is no stop sign and no traffic from the left.
One double lane traffic circle is less than a mile from me. I do occasionally go through on a bicycle when I take a less frequented route to change things up. If there is a reasonable amount of traffic or less, I'll go through it in my lane. If there are a lot of cars and the entry points are backed up, then I'll just take the right turn bypass and then go down to another road to rejoin my route.