Ive only just upgraded to Miui v7 on my xiaomi redmi, just remember its still only based on android 4.4 ! Miui seem very slow on bringing new stable updates out. I will not be getting another xiaomi due to this fact.
Just a warning on updates for Xiaomi phones. I've got the redrice and its a great phone but if your expecting regular official miui updates then font hold your breath. I'm still waiting for miui v6 , it was due February!!