I rather like that there is no forced position for the iPad. Some might like the iPad front and center, but some might want it over to the left, more out of your line of sight with the audience, etc..
And, let us not forget. Most musicians that already have an iPad already have some form of mounting hardware. There are mic stand adapters so you don't need to carry an extra stand, and many arrangers have a music stand, which would support the iPad front and center if that's where you'd want it...
Plenty of musicians already use iPads for lyrics viewers, SMF and MP3 playback, etc.. I guess my major beef is that it is iOS only right now. It's a shame the is no OSX version too. I'm not sure in its current form whether I'd need it on the gig. But as an easy Performance List editor, I sure could use one at home to organize my set lists. But with no iPad yet, I guess I have to wait for an OSX version.
This brings up a larger question, of course. Is the world better now that there are at least THREE more incompatible OS's (iOS, Android, bada) with apps that won't run on a computer or laptop? It must be a developer's nightmare. Time was, Windows or MacOS, and you were done. Now we have so many more choices. But are we better off for it?
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An arranger is just a tool. What matters is what you build with it..!