Again, eh? Why would yo buy an iPad dongle and not the Harmony dongle at this point? Either way the net cost is about the same. You're already invested with the Harmony remote and you're already willing to shell more money out. I just don't see why you don't get the Harmony dongle and just be done with it. Ya it sorta sucks that you have to but good god does it work amazingly well and even with the iPad, you'll still need an IR->Bluetooth solution in some capacity which is going to cost money. The Harmony version of it just happens to be by far the cheapest solution compared to what he others ones cost to.
In my opinion the Harmony solution will be the better option too because of how mature the software is, the vast database of codes, and how well it handles activities. Not to mention how much better a tacticle remote will be over a touch screen for general usage because who wants to look down at their remote every time they want to use it? I used to want an old Philips Pronto $600 remote back in the day because it was all flashy and you could program the screen interface but then I played with one and realized how much it sucked that I couldn't feel anything.