My friend said 余啟文 is no good as he only spent less than 5 minutes on her last visit and she changed to 曾祥風. NO comment on the other one, I prefer women doctor and my doctor is 黃婉霞. She's quite detail and her office is in Mong Kok 雅蘭, each time around 500.
By the way, 簫景生 is no good also, she was referred by my old colleague but she's also very fast. Guess this may be same reason as 余啟文 because they are famous and busy.