Just my opinion:
1) Foreign tyres not necessary better than local tyres. More important is: does it made to the spec that suit M'sia climate? Maybe cheaper import tyre hint something to us?
2) In certain place, eg some parts of Kedah, where ur used tyre can still be trade-in, plus their tyre price also cheaper (hehe, dunno why..) than KL. Unlike KL, hardly ppl want to trade-in our old tyre....
3) Wear off rate (assumed on same driving style & car)
Some tyres are made of softer compound & more rubber than other mixed material in it, hence warm-up faster (its a good thing), quieter but also worn off faster......vice versa: long lasting tyre = harder compund = noisier = not so comfort
4) If tyres were used for >5 yrs & the groove is still there, it dont mean its good condition. The inner cross layer of steel belt may crack, the outer layer may start to have tiny crack already.... eg XXstone / YYstone / XXme
5) Tyres acts as the 1st (primary) layer of "absorber" of vibration, hence "hard" tyre = more vibration, soft tyre less vibration