I bought MI 4A Pro (43 inch) few days ago. It is a superb TV with excellent quality. Overall experience of using the TV is awesome. You Tube, Hotstar and Patchwall content is available through WiFi. HD and SD signals from DTH or cable provider is displayed beautifully in the TV.
However I found one problem with this model. One has to choose the TV source everytime the TV is switched on. Even though the recent update of Patchwall (Patchwall 2.0) has an option to choose a default TV source, there is no easy upgrade to the latest version of Patchwall for MI 4 Pro, 4A Pro and 4C Pro. (While a Patchwall system update is available for MI 4, 4A and 4C models)