I'm lateto join the discussion, but I'd like to say that I'm looking to start using iFly, if it used seemless charts that would be a non-starter for me.
The boundary of the charts contains some crucial information - for example, what time(s) is that restricted area active? What alititude is it? What is the frequency to call for that? All of these are found at the edge of the chart. If you can't access it from iFly, you'd better always carry a paper backup. For me, at least, not carrying that backup is the whole point here.