Share your experience!
@xznewbie: yes , unless you have professional tool to measure battery drain by both devices, the power consumption is more or less the same between dual/single sim versions
regarding the network configuration, I find most xperia devices ( z5compact and Xz user here) they tend to hold on to the last signal, say, in an area 4G is weak and 3g is strong, my xperia will have 4g signal on 1-2 bars instead of having a full bar of 3g signal,. though i really don't care about this, since 1, it doesn't have significant battery impact ( based on my experience) 2, I still get clear voice calls and fast sms. 3.) connecting to network data, I rather have 1 signal on LTE than a full 3.5g signal.