Been running an FS Ignition for about 2000 miles. Quicker starts (I think), hotter spark (I'm told), absolute reliability and consistency in performance, no more messing with points, adjustments, condensers, etc. Love it.
I carry a whole new standard distributor as a spare - along with the quick wiring work-around instructions. But, in spite of the expense, I believe I'll just buy a second FS unit as a spare. Way easier to change out on the road.
Earle