Do you think Daikin achieves the cooling effect as their claims? Just like how car manufacturers claim their own fuel consumption figures?

Well, that's how it is supposed to work isn't it? When the room hits the set temperature, let's say 24°C, then the inverter a/cond can output 23°C air to maintain the set temperature and save power.
The non-inverter a/cond in the same situation will sense when the room becomes 25°C then hit full power and produce 16°C air to cool the room back down, and only stop once the internal hysteresis determines that the set temperature can be met. So if you stand in front of an inverter a/cond the air feels less cold.


*Note : all temperature figures stated are for discussion and example purposes only.