I work on that app along with a small team here at Garmin and were are really proud of what we've done. We are passionate about making great apps and I think Pilot My-Cast really shows that.
WingX and FF are both great apps, but one main thing is we really tried to tailor the app to in-flight use, as opposed to preflight planning. You can see this in how we did the UI to give the pilot fast access to the plates (swiping and sets of favorites), and also in how we do the search features (autocompleting searches, nearby and recent airports).
We also have really great maps, and part of this is a legacy from approaching the same problems in both the marine and hiking apps we have worked on. For example, we can compose any base map with any overlay in our app (i.e. VFRs + METAR data, and in the next version of the app, VFRs + METAR + radar). EFB also nicely does a course-up view of the map, which lots of people at the airshow appreciated.
You should study this link:
If they are, then this would be awesome. It would beat the crap out of having to flip through a book to try to find that one specific approach plate. Typing a few alphanumerics and having all the frequencies show up is so much nicer than flipping through Airport Facility/Directories.
In addition, you can look at plates or airplane sectionals and see that there are a number of items printed in small type and multiple colors that pilots have to contend with. If you want an example, try http://skyvector.com . Someone with flight knowledge can tell you what each of the symbols and colors represent, but that's exactly what we deal with up there(even single-propeller folk like me).
I highly doubt the iPad will be much of a hindrance to that. What I fear the most is:
1) Pilots who rely solely on an iPad and forget to charge it, leaving them without the information needed when the battery goes(assuming they also don't have an alternate power source to charge the iPad).
2). The brightness(adjustable, of course) interfering with night vision. Lit items(instrument panel) are kept to a minimum in the flight deck because of the constant need to be able to keep a watch on other airplanes. Of course, pilots do need to turn on a light to read the plates when it comes time to land, but wise pilots will carry a soft light for reading the plates. Not sure how the iPad light affects it.
If I owned an iPad, I would definitely be interested in this app.
 Pilots who do this, without having any alternative source available in the flight deck are heavily frowned upon.
And for what it's worth, the type can be really small on paper charts. A resizable view is a giant win, there.
1) You can pinch zoom the approach plates, and rotate the iPad for the best screen fit.
2) You can hide the top bar on the Plates screen to make the plate bigger.
3) You can pinch zoom all of the charts, and we provide a magnified "overzoom" that is closer in (but fuzzier) than the native resolution of the chart.
TechCrunch caught the ripoff: