Asus' warranty is taken care of by Rashi Peripherals and Neoteric AFAIK. Rashi's service was a bit bad before but several users have reported that it has improved over time. Of all places, Rashi's Kolkata branch seemingly has offered very bad service. Not sure about their present state.
To be frank it depends on area.In mumbai around 2 years back when i last enquired about asus product a dealer himself suggested to stay away .saying he has 2 lakh worth of good waiting for Rma and he was waiting because already 5 lakh worth of good was refused by service guy suggesting silly reason hence they boycotting asus all together.