No, I didn't use any defects inspection services. I asked my contractor who is going to do reno for me to meet me in the unit. He spotted the peeled laminate and helped to check for hollow tiles. So far, no other defects found from him. Even he is quite impressed. He mentioned he can find many hollow tiles from other projects from China developers. So I guess we make a good bet.
Anyway, defects reporting period is 1 whole year. So long as you can prove that your renovation doesn't involve certain areas, any defects found there, it's still covered under warranty.
I think in actual fact, it all depends on how big is the job. If you expect them to change all tiles for you, you better prepare to wait long long