I do have a trow IRA as well as owning Trow stock. (So I do have vested interest in you paying tons of fees BUT I would rather you not pay many fees, as an informed investor.)
If I remember correctly, just make sure that all your paperwork is electronic, and not snail mailed to you and there should be no additional fees. Or at least no additional fees I am aware of. Could be something specific about the 457 but I doubt it.