The Source blog says all is well since the toll lanes opened on Saturday. ExpressLanes converted 14 miles of existing HOV lanes to HOV/HOT lanes during non-peak hours, which means solo car commuters can buy their way into the carpool lane. But it also means that carpoolers need a transponder -- which has been controversial.
More info on how  to get a transponder here.

A Streetsblog story notes that when NYC Mayor Michael Bloomberg first proposed congestion pricing for lanes in New York he got a lot of pushback, but LA Metro has not gotten much flak here.
Read more.