As a replacement for TC it is a great idea, add enroute charts with some functionality. Basic flight planning, moving map. That’s about it so far in version 1.
Now for the downside.
Huge download from an apparently overworked server. It took me 4 days including a whole new database. It does not use the TC database. FD also has a problem looking up it’s own data. Read the Apple app store reviews. I have gotten the GPS to display once and that was standing outside my house while playing with it. Had to move the airplane to the hangar today so I took the ipad and GPS to try out the moving map on the airport chart, no go. It would not pull up the GPS data even though Flight Aware had no problem. I also had to reboot to get it to pull up the airport chart even though it new it was available.
So I guess if you don’t need it wait for version 2.
John in Saudi