I am now using this app every time flying FSX. It may not work with all the addon planes such as NGX, but it works great with all the planes I flew. It does pretty much EVERYTHING I need when flying, like control the autopilot, set the raido, look at the FMC, and it has built in data base which is super convenient
for checking out VOR, NDB, airports, etc on the fly. Its priced at $25, but its a steal if you consider, as someone already pointed out, it does the things that would otherwise require you to buy multiple apps. For instance, there is an app that only does the radio in FSX and it costs $15...
The app can certainly benefit from a bit more polishing on user interface and display layout. But right now its perfectly functional. It does not upload flight plan from apps FMC to FSX, but it downloads flight plane from FSX no problem and makes it really nice to monitor the flight on iPad.