 Whilst comfort was not their strong point, the five- to ten-minute frequencies transformed patronage levels in the towns of Aberdare, Barry, Bridgend, Cwmbran, Ebbw Vale, Penarth, Pontypridd, Porth, and Tredegar.They were even seen in Newport and Cardiff.Five blue Bustlers were introduced in Pontypridd when the council run Taff-Ely (previously Pontypridd Urban District Council) operations were taken over.