I AM USING THIS APPLICATION FOR LAST 7 MONTH.
SHAREit is such an aap which uses the wifi technology to share files over quickly two enabled devices.
I Used this aap many times and he gave me always poor response.
As most of you all know users cannot transfer files between cross platform devices like iPhone and Android. So it is a very lag point which I always face. After all SHAREit is not working since upgrading to miui6.so it is a very disappointing to me.