Used UBER during a trip in Mumbai in March. The driver got lost and we waited almost 40 minutes for him to pick us up. The car was a really nice huge 4X4 and the ride comfortable enough. My only worry was that he was unsure of where to take us and had I not research it beforehand to give directions he would not have been able to take us, despite the GPS, which he didn't know how to use. He also seemed to be expecting a tip but that could just have been a language barrier where I didn't understand what he was asking for.