Source: I purchased the first iPad when it came out, and I've gone through all of these. The first let-down was Orphion: when I purchased the app it was amazin

Source: I purchased the first iPad when it came out, and I've gone through all of these. The first let-down was Orphion: when I purchased the app it was amazing, but they used the finger touch API in a way that Apple did not agree with. They were forced to remove that API call in an update, and the app has not been the same since. Unfortunately I did not get a copy of the original version, and so I lost access to that specific experience that I paid for.