The 529 college savings plans have restrictions on what you can invest in (no individual stocks only mutual funds), the number of times you cantransfer between funds (once a year), and what the funds can be used for (college related expenses).
But once the transfer is complete, you can watch the program on the iPad at any time, including when you have no Internet access such as on my recent flights.
Once logged into the app, you can send and delete eKeys, or transfer them to another device (this also deletes the eKeys associated with a lost handset, for example) -- you can even create eKeys that only work once.