The original 5W laser head malfunctioned, prompting me to upgrade to a 10W laser head that included an 'air assist' nozzle and a matching power supply unit. While I haven't had much chance to fully test the new 10W laser head, it seems to be functioning properly and I am currently awaiting the arrival of the new air assist pump. The delivery of the replacement head was impressively swift, despite it being shipped from China.