Playfair,
You are about on the money, I use 120ml of each a day.
I spend about $20 a month on the two gallons.
I have heard good and bad about reactors, and since I haven't had a reactor, I can't comment for sure.
I do know, with the amount of fishing trips I take for days at a time, I am more comfortable with dosing the B-ionic, that way the babysitter just has to feed and top off water.
I would worry more than I do now I think, about adjustments needed and not being there to do them.
I may be totally wrong, but I don't think a reactor is just set it and forget it.