I went to school with a girl, who had "tiger parenting".
She used to have to study all through half-term, every evening, and had piano lessons. Although she did rebel a little, she managed to keep the discipline up, that her parents had taught her, and got all her A*s at GCSE and A's at a-level. The main motivation was moving away from home!
At school, I thought it was awful that she had to work so hard, and she loved to moan about her parents. However, she went to Cambridge, has a fantastic well paid job, which she loves, and a gorgeous fiance.
We have kept in touch, and she has said that as an adult she is grateful for her strict parenting. I think the biggest benefit, has been the discipline and focus she learnt as a child. I have met adults who have complained about their laid back parents, who never pushed them at school.
A girl in my brothers year, had very clever parents, and was expected to get brilliant A-level results to study medicine, but committed suicide due to the pressure. I personally think it is important to motivate your children, but not pressurise them - if this is possible?