Sorry to hear about your frustrations.
Please make sure that you only have the Skanect App open when trying to make a scan, and that you have a reliable and strong WIFI connection if you are using the uplink functionality. If Skanect is asking you to rescan, that usually means you are moving too fast over the object for Skanect to keep up. Also, it will ask you to pause to make Key Frame pictures from time to time.
You should have a look a the following article for tips on how to get the best scans while using Skanect: http://forums.structure.io/t/tips-for-using-skanect-with-structure-sensor/6711
There are a bunch of iPad apps out there for the Structure Sensor. You can find all the app available by going to Settings > General > About > Structure Sensor. Once there you'll find a button that will take you to the App Store to show you every application available right now.
Please let us know if you are still having difficulties with your scans.