I'm using fore flight for planning and an efb only. It is nice not having to lug 50lbs worth of paper any more. I didn't bother spending the additional $100 to get the tracking on the plates and diagrams. Just like when GPS first came out. People were hitting the dirt left and right. I'm sure we will have our share of the same with this if pilots don't properly train themselves on the equipment before using it in real conditions. This is nothing new though. Tablets in the cockpit as efb's have been around since the '90's.