Sounds great, just one question about those dented box deals for Gibby's, how would they replace the unit if in the unlikely event that it failed within say 30 days, and they don't have another damaged box in stock? Their undamaged box ones are on sale for $1199, that's still a good deal. I am considering getting the 4400 too.
Regarding the APP, it works very well, but as expected, it is very difficult to shape the curve so the larger the screen the better obviously. For Android devices, you only have pay once, and can then use it on multiple devices. I assume it is the same for the ios devices but you should double check that yourself.
@rm3 has much more experience in using the App, ask him if you have more questions.