Brought my two kids, aged 10 and 14, to learn cycling from Fai. A bit apprehensive at first. After the first half of the two-hour lesson, my wife and I were elated to see our younger child balancing pretty well on two wheels. Soon after, she was peddling around confidently.
The older girl took a bit longer because she was tense, but eventually managed to cycle on two wheels too. It certainly helps that Fai was patient and encouraging.
Definitely worth the time and money, especially if you had tried teaching your children yourself and did not succeed after a few outings.