Werner, I am also using Coach's Eye while filming on the iPad. I found out that to get full quality you need to have to pay a subscription fee. Like you, I generally don't like that business model, but in this case I see no alternative and I think it's worth the cost.
Yes if you're working with videos regularly, but here in Hamburg taking photos or videos is strictly forbidden :-(( and for the one or two times a year, when a student and I can dive under pool attendants' "radar", risking sacking... Think I'll go the cumbersome way with my cheap video-editor....