It was a little early for me to do math when I posted it, JG, and I wouldn't be upgrading all the lines at once. One at a time, just like you plan to do; giving me a new device every 8 months instead of every 2 years and the family gets to fight over the hand-me-downs. So doing this one at a time: if I have to lose that deal on all lines (since it's tied to my primary) then (a) it seems like it's eventually money in the bank for me; and (b) I have the flexibility of flat-out OWNING the phones and staying month to month on this deal.
Since they're only subsidizing about $300 of the cost, at an extra $60 a month I'd be in the black after 5 months or so on each device. If I'm keeping each phone for 8 months, that's $180 per phone I'm saving, or $540 on all three as they cycle out.
Am I right, do I need more caffeine or do I need to go back to math class? LOL