I hate them.
Some are OK if properly designed-there is one in Anchorage that has 3 lanes, and I’ve come close to getting creamed there more than once. How it seems to logically work and the actual use are not in synch and if you followed the old directions the state posted on the net, which did not match the signs in the actual roundabout, doom was kind of likely. Judging from the piles of broken glass and plastic, I’m not the only person who has trouble with it. I pretty much refuse to use it anymore
The local traffic engineers have been installing them at most of the new major intersections. They are very efficient and most of the time you barely even have to slow down and rarely do you have to come to a full stop. The feds subsidize them because the fact that you don’t have to come to a full stop and then accelerate from a stand still means that it eases air pollution and decreases gas consumption. Of course, there are some folks who just can’t seem to get the hang of them, but there are morons wherever you go.