I don't have it yet... so it would be interesting to hear from somebody who does 
regarding the 10inch display... given the thing does not have a GPS (!) you'd have to buy an USB GPS module. Then you can have the Iconia W500 on your knee like another kneepad with the GPS module thrown on the panel to catch the satellites... so the size issue would not be really an issue I can imagine
also... one could have all other Win based applications on it like the Jeppesen Charts for instance (a great help in case you don't have a printed chart in the cockpit).
All I am looking for is an all-in-one solution - i.e. a device that could give me all I need for my aviating around. A Win based tablet looks like it 
And btw. it is actually Acer (not Asus)