Hi Indising, I bought the Xiaomi V1. According to the sales person at the Xiaomi shop, they have only brought in the V1 so far and they will honour the 1 year warranty for the Xiaomi V1. As for Roborock V2, as these are brought in by parallel importers, and Xiaomi Singapore will not honour any warranty for the Roborock V2.
As far as I know, V2 has the mopping capability and slightly bigger suction power but from what i have read and watch on the internet, the mopping capability is not that great.
Regards,
Angelo