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I suspect, like roundabouts in general, it's maddening and/or frustrating until you use it and then you go ...oh... And then you feel silly for getting so worked up about something that's actually really fucking effective.
To put some numbers behind it, the theoretical capacity for a regular roundabout is 20-25k vehicles/day, whereas the above can process up to 40k/day, mostly dependent on where the largest flows come from. (A regular intersection with traffic lights can handle between 20-35k.)