Having recently returned to this forum after a long-ish break, I've found an interesting thing. It seems that, like fashion, things in the model T world come into and out of style.
Back then, the "Truefire" was all the rage. I heard & read very little negative reports about it. At the same time the "E-timer" was getting all sorts of bad press.
More recently I find its completely the opposite, with the "Truefire" coping some flack and everyone singing the praises of the "E-Timer".
I'm not asking for an explanation as to why, I'm just stating my observances.
Rob -- I'll state my observances too. One thing I noticed about the Tru-Fire setup is that for the first couple of years they were available, they worked great and everyone loved them. Then, after they got to be 2 or 3 years old, they began failing. When they failed, no one know how to fix them, and apparently the fellow who made them was not responsive to calls or emails when folks needed help.
The E-timer is now the "cat's meow." I have no experience with either one, but sooner or later the E-timers probably will begin to fail as well. Hopefully its maker (who often posts here) will be more responsive and helpful to his customers in need. I expect that will be the case.
One thing going for those of us who use Ford's original system (some with aftermarket timers) is that it's easy and relatively inexpensive to carry a spare timer and coil when touring. If part of the ignition system quits functioning, you just fix it and go on, as Ford intended for most parts of the Model T.
I now understand why it is so....