Ex-section 9 onwer here, stay for 5 years. Left PH for 9 years dy.. Nope for me its not a good buy good stay area.
1. Not dog friendly.
2. SD clever sell house but don't care to develop the commercial area.
3. Bad experience with kids from the low cost flats who came to destroy the playground in Sec 9. My ex-house is facing the playground.
4. Bad traffic if use access from Puchong.
5. Lousy community at Sec 9, so many defaulters for security fee.
6. High crime rate
    -attempted break-in, my house.
    -corner house, kids playing with dad suddenly 3 man climb over the fence and held the kids by the neck with a parang.
    -one neighbors house break in, thief climb in thru toilet window.
7. Not neighbor related, community related... but hell creepy story.. the Chinese restaurant behind OnKing, one of the hawker selling pork noodle, practices black magic. Yes WTF.. her competitor (not direct competitor also, ppl food better more customer she redeye/jealous) is the stall in-front of her, whole fam include the pet dog, died. Only survivor become mental unstable.

If I'm not mistaken, Hannah Yeoh also stays at PH? Her house is with a very nice tall bronze gate with sunflower motive, in Sec 11 I think..