tuaw.com has a mac bundle for free for the next few days. https://deals.tuaw.com/sales/the-mac-freebie-bundle-3-0
In the bundle is X-Mirage that can mirror your iOS device onto your mac and has a record function (for your app demos). I just tested it and it works really well.
To download you have to register and follow + share on FB or Twitter or Google+
Small price to pay I guess.
ps. I’m not affiliated in any way.