I've got a few music apps for iPad but this is the first one that has really impressed me. I've only done some casual fiddling over the past day with it but it's great to be able to work with audio files (no midi at this stage) in such detail with your fingers. Easy for zooming in and out, editing, using automation, and it's quite decent effects and a nice mixer. It doesn't have OMF import/export for use with Sonar but I'm going to request it on the app's forum. Clearly it's no replacement for a desktop but it's a different beast. I bought it because I'll be away from the home setup for a month and I'll use it for developing ideas. So, while I don't have any plans to attempt to use it for "more serious work," I must say that it is seriously interesting.

Posted my request in the forum. It seems that OMF is not feasible with iOS, unfortunately.