He won one ranking title, reached two further finals and several semi-finals, and spent four seasons ranked among the top 16. Harold was renowned for both his very strong defensive play and his unusual cue-action, with which he is able to unleash a great deal of power on a shot without using backswing on the cue. Despite safety play ultimately being considered his strong point, he compiled 143 century breaks. Steve Davis has commented that he is not the most naturally gifted player, but makes up for this with strong tactical play. For his technique and grinding play he has been compared to Cliff Thorburn.