Yep, the best iPad integration implementation by far. The iPad sits solid within the controller, touch is great, no bounce, no fear of someone leaning on or knocking your iPad from it's perch at the back (audience facing) side of your controller.
But ... it sits portrait.
I don't buy the whole "it's an older controller" theme. It's gone into second life not to long ago, a clear sign that it is a very popular model or it would have been dropped long ago.
I do understand that having to through the whole screen orientation around just to support on controller is a design challenge not worth the trouble.
So iDJ Pro users (like me) will have to settle for DJay 2 or get really serious about learning an app and go with DJ Player.