I use an App called Oz runways which seems similar to Skydemon and others available. It costs me $79 Australian per year for the VFR package and is updated with the AIRAC cycle.
I also have an Aera 500 purchased before Oz runways. As mentioned it is expensive to update. Because the updates cover a larger area than where I fly there may not be anything relevant in their frequent updates so I haven't updated for ages. Cities and airports don't move. It sits above my instrument panel and provides the usual magenta line for quick reference whereas my iPad is on my knee.
The Aera 500 also has the strange non aviation Garmin maps. Oz runways has all the aviation format charts, shows rain radar and frequencies, calculates plans and can submit them as well plus a whole lot more on a large screen.
In my opinion, don't waste time and money with the Aera.