Lower operational speeds yield fewer and less severe accidents. Since roundabouts are unfamiliar to the average driver in the US, there is likely to be an initial period where accidents increase. Capacity - Traffic yields rather than stops, often resulting in the acceptance of smaller gaps. This may increase the delays on other legs and the number of accidents. No stopped phase for peds who want security of a signal.
Longer paths increase travel distances for both pedestrians and bicyclists.
These basic principles apply to all roundabouts, remember them and drive defensively. Display your right turn indicator on the approach and through the roundabout. Unless signs or lane markings indicate an exclusive right turn, approach in the right lane and stay in that lane through the roundabout. If the right lane is blocked due to dense traffic or road obstruction, then approach and continue through the roundabout in the left lane. The recommended course is shown by the solid red line with the alternative course shown by the red dotted line.