I have been using WingX for two years and find it to be excellent when it works. Unfortunately, it suffers (as does Foreflight) from the Apple bluetooth bug which causes it to occasionally lose connection with my Dual external gps, rendering the moving map useless. On a recent ifr flight, 30 minutes before landing, I got the 10% battery life warning, shut down the iPad until just before landing, and turned it back on only to find that it was unable to connect to the gps (which was working fine with lots of satellites and 66% battery left). I used my iPhone (held by my wife) for the remainder of the flight.
In my opinion, they made a very bad programming decision to only invoke the "Auto APD" (automatically display the apt diagram when landing) with a chart in place. On another ifr flight in vfr conditions, I landed at an apt with a very confusing set of taxiways and almost had a runway incursion due to the apt diagram not displaying. I cant imagine a situation where one wouldnt want to see the apt diagram after landing. (At least, there should be an option to always show the airport diagram).
This app suffers from very marginal support -- I have made numerous phone calls and sent many emails without any response from the company. On my one recent successful interaction with them, they said that my email was mistakenly put into the trash (as was my recent phone call, apparently). It would also be nice if they had a more complete user manual (Foreflight shines in both of there areas).
For these reasons, together with the extreme difficulty in using the iPad display in bright sunlight, I have chosen to return to my former policy over the last 30 years and use paper charts.
wb7vtv about WingX, v8.0.0.8